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 2, 2010
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Jack Off: When a male masturbates.
Fank is going to jack off in his room.
by ~Keyona January 10, 2004
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When the protagonist of the TV series 24, Jack Bauer, kills someone who had a name in the show.
Ha, I'm so happy that wench Dana Walsh antagonist got Jacked Off
by ThatGuyWithTheHook May 4, 2010
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When a young man or old man (can be both) get hard or also known as horny, they're penis starts to rise up. If they don't have anyone at the moment to help them with their needs, then they go to a private place such as the shower or their bed or also local wal-mart and go in a up and down motion on their penis. Causing them to feel the pleasure of having sex with a girl, or also feel the burn. When they reached their maximum pleasure a tasty substances called cum squirts out, and that is when he or she knows they are done jacking off.
Last night i could hear my dad jacking off

Me and your dad jacked off to porn last night
by iknowuwithallmymight May 14, 2010
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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 28, 2006
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