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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 23, 2003
to get off by rubbing your dick
I love to jack off to porn!
by a sd fgd jdxfgh sf October 01, 2005
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
1) When an angry mother orders her son (named Jack) off a ride outside Tesco.
2) To masturbate.
1) "Get off the Postman Pat ride, you've been on long enough... JACK, OFF!"
2) "Dude, I am going to jack off."
by Soiled Undergarment August 15, 2003
5 knuckle shuffle
when I was 12 I would do it 3-4x a day.
by alex December 30, 2003
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".
by Mr. Friscus February 02, 2010
1. The action a guy is doing when masturbates.

2. A person who is a motherfucking asshole dipshit. Basically. Also can be called a Jerkoff. (See 'Jerkoff' for more information.)

3. A nickname you give to someone named "Jack".
1. I had some good porn in front of me, so I just had to jackoff to it.

2. Guy: *Slaps girls ass*
Girl: Damnit! You're such a Jackoff!

3. For Jack's birthday, I gave him a card that said "To Jackoff"
by FangPawnFire December 31, 2008