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.
by Anonymous October 28, 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
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
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
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
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