A dictionary of slang - "J" - Slang and colloquialisms of the UK.

j	Noun. A marijuana/cannabis cigarette. Abb. of 'joint'. [Orig. U.S.]
jab	Noun. A hyperdermic injection, a vaccination. E.g."You don't need hepatitis jabs to visit Cornwall, it's not a foreign country."
jack	Verb. To steal, often in relation to mugging. From hijack.
jack all	Pron. Nothing. E.g."There's jack all wrong with it."
jack and danny	Noun. Vagina. Rhyming slang on 'fanny', slang for vagina. E.g."What, with her short skirt, and no knickers, I had great view of her jack and danny." See 'fanny'.
jack and jill	Noun. A pill. Cockney rhyming slang. [Mainly London use]
jackanory *	Noun. 1. Story. 2. A lie, a tall story. * Rhyming slang on story. [1970s]
jackbit	Noun. Food, or more specifically a packed lunch. [Lancs use]
jack in	Verb. See 'jack (it) in'.
jacking off	Noun. An act of masturbation. See 'jack off'. [Orig. U.S.]
jack (it) in	Verb. Stop doing (something), to terminate (something), to end. E.g."I'm going to jack in my college course after the vacation, it's too much like hard work."
Jack (Jones)	Noun. Alone. Rhyming slang. Usually used in the expression on your jack, or on my jack. See 'on ones jack'.
jack off	Verb. To masturbate. Usually applied to males. E.g."I jacked off to the thought of her completely naked apart from wearing a pair of white cotton pants." Cf. 'jill off'. [Orig. U.S.]
jack shit	Pron. Nothing. [Orig. U.S.]
jacksie	Noun. Buttocks, or anus.
jack's alive	Noun. Five. Rhyming slang.
Jackson Pollocks *	Noun. 1. Testicles. 2. Nonsense, rubbish. * Rhyming slang on 'bollocks'. See 'bollocks'.
Jack-the-lad	Noun. A male who is quick witted, a rogue who looks out for themselves.
jack-up	Verb. To inject with drugs.
jacobs	Noun. Testicles. Rhyming slang on Jacob's Cream Crackers meaning 'knackers'. Cream Crackers being a dry savoury biscuit usually served with cheese and Jacobs being the manufacturer. See 'cream crackered'.
jaffa	Noun. An infertile male. From jaffa oranges being seedless. This term either gained prominence from or was invented for the British TV sitcom Only Fools and Horses in the 1990s. Derog.
jag	Noun. An injection. [Glasgow use] Verb. To prick. [Glasgow use]
jailbait	Noun. An attractive female or male who, viewed sexually, is younger than the legal age of sexual consent. Also jail bait. E.g."I'll warn you now, dont get involved with Mike's sister, she's jailbait."
jake/jakey	Noun. 1. A drunk, a meths drinker. Derog. [Scottish/Glasgow use?] 2. A down and out, a homeless person. Derog. [Scottish/Glasgow use?]
jaked	Adj. Drunk, intoxicated. Probably from 'jake' (noun), above.
jam jar	Noun. A car. Rhyming slang.
jammies	Noun. Pyjamas. Cf. 'jimjams'.
jammy	Adj. Fortunate, lucky. {Informal}
jam packed	Adj. Full to capacity. {Informal}
jam rag	Noun. A sanitory towel, a tampon.
jam roll *	Noun. 1. An idiot. 2. Anus. * Rhyming slang on 'arsehole'.
jam sandwich	Noun. A police car, specifically the white ones with a bright red band running horizontally along the sides.
jam week	Noun. The period of menstruation.
jangle	Verb. To gossip. E.g."Are you two going to sit there jangling all night, or help me cook the meal?" (Liverpool use)
Janner	Noun. A person from Plymouth.
Jap's eye	Noun. The urethal opening on the head of the penis. Offens.
jar	Noun. A glass of beer or lager, usually a pint.
jarred off	Adj. Upset, fed-up. [E. Anglia use.]
J. Arthur	Noun. An act of masturbation. Rhyming slang on J. Arthur Rank, with 'wank'. See 'wank'.
jasper	Noun. A wasp.
jazz mag	Noun. A pornographic magazine.
Jeez!	Exclam. A profane exclamation of surprise, frustration. A shortening of Jesus.
jellies	Noun. Cheap rubber/plastic sandals mainly worn by children. Their transparent and brightly coloured appearence resembles jelly, hence their name.
jelly	Noun. Temazepam (a tranquillizer). Usually in the plural. E.g."I'll need some jellies if I'm going to get some sleep tonight."
jellyfish	Noun. A weak and ineffectual person. Derog.
jerk	Noun. Idiot. [Orig U.S.]
jerk-off	Verb. To masturbate. E.g."He's in his room, jerking off to that new adult film he brought." Noun. An idiot, a despicable person. Derog. [Orig. U.S.]
Jerry	Noun. 1. A German, or from Germany, often in a military context. [1914-18] 2. A chamber pot. Dated. {Informal}
jessie	Noun. A feeble, easily scared person, a softy. Derog.
Jesus!	Exclam. A profane exclamation of surprise, anger, frustration.
Jesus boots	Noun. Sandals.
Jesus creepers	Noun. Sandals.
Jesus freak	Noun. A strong believer in Christianity. Derog.
Jesus H Christ!	Exclam. An exclamation of surprise, annoyance.
Jesus suffering fuck!	Exclam. Expressing surprise, or anger.
Jesus wept!	Exclam. An exclamation of annoyance or surprise.
jet	Verb. To move quickly or depart hurriedly. E.g."I'm just gonna jet into town to collect my holiday money."
jewels	Noun. Male genitals. Cf. 'family jewels'.
Jewish piano	Noun. A cash register. Can be offensive due to racial stereotyping.
jiffle	Verb. To fidget, to be restless. E.g."I got no sleep at all with her jiffling about in bed all night." [Norfolk use? Dialect]
jiffy	Noun. A moment, a short time. E.g. "Wait there a second, I'll be back in a jiffy." {Informal}
jigger	Noun. An alleyway, back passage. [Liverpool use]
jiggered	Adj. 1. Confounded. Heard in the rather archaic exclamation, I'll be jiggered! {Informal} 2. Worn out, exhausted.
jiggery pokery	Noun. Deception, trickery, dishonest behaviour. {Informal}
jiggy	Adj. Cool and in touch with what's happening and respected. Apparently originates with Will Smith, U.S. rapper and movie star, and came to prominence with his song Gettin' Jiggy Wit' It. [Orig. U.S. 1990s] Noun. Sex. [Orig. U.S. 1990s]
jilling off	Noun. An act of female masturbation. See 'jill off'. [Orig. U.S.]
jill off	Verb. Of women, to masturbate. Expression punning and created as a female equivalent to 'jack off'. [Orig. U.S.]
jimjams	Noun. Pyjamas. Also 'jim-jams'.
jimmy hill	Noun. A pill. Rhyming slang. Jimmy Hill - football player, manager and then TV sports presenter.
jimmy riddle	Noun. An act of urination. The rhyming slang for 'piddle'. Often used singularly as jimmy, or riddle. See 'piddle'.
jip	Noun. Hassle, bother. Cf. 'gyp'.
jism	Noun. Semen. Also 'gism'. [1800s]
jitters	Noun. Severe nervousness. {Informal}
jitty	Noun. An alleyway or passageway between buildings. Also gitty. [Midlands use]
jizz	Noun. Sperm. Abb. of jism.
Joanna	Noun. Piano. Cockney rhyming slang.
job	Verb. To hit, punch, physically attack. E.g."Stop shouting at me, or I'll job you!" [Notts use]
jobby	Noun. 1. A lump of excrement. 2. An act of defecation. E.g."Give me 5 minutes, I've just got to have a jobby."
jobby jabber	Noun. Homosexual male. See 'jobby'. Derog. [Mainly Scottish use]
job's a good'un!	Exclam. Expressing a thing or situation is good.
jobsworth	Noun. A person who is very pedantic at work and strictly adheres to the rules; so called because of their oft used exclamation, "I can't let you do that, it's more than my job's worth." Derog.
Jock	Noun. A Scottish person. Can be offensive.
jockey's whips	Noun. Chips, French fries. Rhyming slang from the North-west.
Jodrell	Noun. An act of masturbation. From the rhyming slang Jodrell Bank - 'wank'. Jodrell Bank, a large radiotelescope in Cheshire, North-west England. See 'wank'.
Joe Baxi	Noun. Rhyming slang for taxi.
Joe Bloggs	Noun. A fictitious name for the average or unknown person. {Informal}
Joey	Noun. 1. A friend or acquaintence who is regarded a fool or weakling, and often has to bear the brunt of jokes. Believed to be derived from the rhyming slang Joe Hunt, meaning 'cunt'. 2. An imbecile. Derived from the name Joey Deacon, a physically handicapped (cerebral palsy) guest on a British children's TV programme called Blue Peter in the 1970s; consequently his name was cruelly adopted by children as an insult. Derog. Cf. 'deacon'.
John	Noun. 1. General term of address for a male. [London use] 2. A client. Prostitute's parlance.
johnny	Noun. A condom. Derives from the term French Letter via the archaic slang Frenchie and consequently Johnny Frenchman.
John Thomas	Noun. The penis. A well established but aging euphemism.
joint	Noun. A cannabis or marijuana cigarette.
jollies	Noun. 1. Pleasure, thrills. E.g."He always gets his jollies from hurting others." 2. Holidays, vacation. E.g."Are you going to mainland Europe again for your jollies?"
jolly	Noun. A day trip, particularly one taken for pleasure and arranged from ones place of work. E.g."Work was great last week, we went on a jolly to London and got the boss drunk."
josh	Verb. To jest and joke with someone. E.g."Dad! Stop joshing me. She's not my girlfreind, just a mate."
joskin	Noun. A rural dweller, a country bumpkin. [Yorkshire use]
joyride	Noun. A ride in a stolen vehicle. {Informal} Verb. To go on a joyride.
jubblies	Noun. Women's breasts.
Judy	Noun. A woman, or girlfriend. [Liverpool use]
Judyscuffer	Noun. A police woman. See 'judy' and 'scuffer'. [Liverpool use]
jug handles	Noun. Ears, usually implying large or excessively protruding.
jugs	Noun. Breasts.
jumbly	Noun. 1. A jumble sale. 2. The unwanted goods and possessions which are sold at a jumble sale.
jumped up	Adj. Arrogant. {Informal}
jungle	Noun. A dance music based around speedy 'breakbeats', 'dubby' bass and 'samples'. It originates from rave and hardcore dance music.
jungle bunny	Noun. A black person. Derog./Offens.
junglist	Noun. A person interested and committed to 'jungle' music.
junkie	Noun. 1. A heroin addict. Also spelt junky. 2. Now more frequently used for anyone with an addiction.