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
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
to get off by rubbing your dick
I love to jack off to porn!
by a sd fgd jdxfgh sf October 01, 2005
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. 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
1. Verb. Exercising the art of masturbation
2. Verb. To create an orgasm simulating another sexual partner with the hand or other masturbating aids (e.g. fleshlight, hand, dildo)
3.Noun. An asshole, homo, or otherwise retard who's by calling them a jack-off is saying that they shouldn't have been born and was a waste of sperm which is a jack-off
4.Noun. A waste of sperm produced by the art of masturbation
Tom is a porn addict, therefore he likes to jack-off.

Tom jacks off in public for everyone to view therefore he is a jack-off.

Tom likes to jack-off so much his girlfriend has nothing to do but, jack-off.
by Tom February 27, 2006

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