Composed of two words, jack and off. See those for the individual meanings.
I helped my uncle Jack off his horse.
by N. 1. August 26, 2006
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To masturbate.
Can also be used to unexpectedly shock people.
Grandma caught her 15 year-old grandson jacking off (masturbating) and she passed out, had a massive heart attack and died.
by chikillanto August 23, 2003
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To grab the hard, erect penis and rub it in a firm motion up and down until it turns red and is towards the point of ejaculation.
I haven't jacked-off in a while. So I'm gonna make up for loss time and jack-off for 18 minutes straight.
by Bentropelex November 24, 2003
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Causes Pleasure and Anger. The pleasurable part is pre-ejaculation. The Anger part is post-ejaculation. This is the part where the man becomes mad at himself for wasting 30 minutes of his time. The world suddenly becomes clear and the chemical imbalance is one again balanced. Too bad no man learns this lesson and history repeats itself.
I had a great time jacking off, up until the end.
by Patrick April 24, 2008
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rubbing the penis so he spits up his cum
what I'm doing as I'm writing this, oh man just ejaculated everywhere
by I'm jacking off September 7, 2003
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when a guy rubs his big throbbing cock cuz he can't put it in my pussy cuz i am too busy rubbing it to notice him
by sexybabe August 21, 2003
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To masturbate until the point of ejaculation is reached.
Oh, oh, ho, oh my god, wait.. wait a..., oh OH SHAZAAAM!
by gabe April 22, 2005
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