To quit something, eg: cigarettes, job, course, a sport.
Person 1: Are you coming to footy training.
Person 2: Nah, I'm goin' to have to Jack it in, work changed my roster.
by Face-ache May 15, 2019
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jack is a man whos dad left and he lives with his silly bitch of a mother
jack "wheres daddy"
silly bitch "he left your sorry ass"
by jack_no_dad December 24, 2022
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to masturbate to the extreme or with extreme force after you have been said 'no' to
Man I really needed to JACK IT when my bitch didnt gimme no head. Damn cunt.
by Bobby Suddson December 27, 2007
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