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jack off 

too masturbate, to stroke your penis until it ejaculates
dude, im so horny, im gonna go home and jack off to some porn
jack off by dadouf January 11, 2002

jack off 

To stoke the penis up and down in a motion like if you were to shake milk.
Today when I shook my chocolate milk, after 20 minutes it turned white thanks to the jack off motion.
jack off by Anonymous October 28, 2003

jack off 

1. To Masturbate, as in a male.
2. A stupid male (usually "jack-off").
1. I'm horny. I'm going to go jack off.
2. You retard, don't be such a jack-off
jack off by Brown Sugar March 18, 2003

jack off 

to look and porn and pop a woody, get some lotion, put a generous amount on your main hand (sometimes other hand if youre looking at porn on internet or computer), grip your penis, then move your hand rapidly up and down the shaft of your penis.
spank the monkey, choke the chicken, beat the meat, yank the yak, masturbate, wank off, whack off, etc.
jack off by sean paul? June 1, 2003

Jack Off 

1. What a man does when his penis erects into a throbbing, veiny, pulsating, kinetic hard-on, stroking the shaft repeatedly up and down with his hand until the penis barfs up massive amounts of white-nut vomit in either a clean, streaming squirt or in a gelatonous, oozing mass.

2. To make one's dick sneeze, throw up, explode, ejaculate, cough up white blood, splooge, climax, orgasm, erupt, belch, detonate, spew, or spit, possibly on another person's face.

3. A person who amounts to nothing, or should not be taken seriously.
1. "Boy, I just watched too much Full House, I need to go jack off".

2. ".. and then she got down on her knees and I jacked off all over her face".

3. "Dude, you need to get up off of your ass and quit watching gay porn, you good for nothing jack off".
Jack Off by Mr. Friscus February 3, 2010

jack off 

if you're under 13: you're not cool enough to know what it means. come back when you wake up and its sticky in your danger zone.

if you're over 13: why the FUCK would you need to look up the definition of "jack off?" did your balls not drop yet?
why the hell would any guy who's hit puberty need to look up what "jack off" means?