(intransitive, colloquial, vulgar) To masturbate.

plural of jack / (poker slang) A pair of jacks. / (UK, rhyming slang) Heroin tablets (from "jacks and jills" = pills)

(slang, now chiefly Ireland) Alternative form of jakes: an outhouse or lavatory.

(games) A children's game involving picking up objects; knucklebones; jackstones.

present participle of jack

(colloquial) A street robbery.

(slang) High on drugs or stimulants. / (slang) Broken, imperfect, especially when followed by 'up'. (See jacked up) / (slang) Strong and/or muscled.

(slang) simple past tense and past participle of jack (stole)

plural of Jack

A surname originating as a patronymic derived from Jack.