To play with your dick until you cum.
I had to jack off, because I had the massive blue balls.
by Jack Balls May 11, 2004
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When Chris, Tracey, and Jackie walked around to the back of our store and saw a bum jacking off in the bushes.
by Sarah August 3, 2003
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To masturbate; the stimulation of a male's penis until orgasm is achieved and ejaculation occurs.
Jill didn't want to have sex right now, so Jack decided to jack off.
by Phillip Knowles January 19, 2006
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rubbin ur penis wit ur hands or objects
it feels wicked good but its not as good as pussy so guys do it when theyre not gettin any
all guys do it like evry day im doin it right now
by billy bob December 15, 2003
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Male masturbation; a man rapidly and repeatedly rubs his hand up and down his dick until he hits orgasm.

Done when horny, when porn is plentiful, or to get rid of a boner in class.
Jason had a huge boner in science class, so he ran to the bathroom. But there were a whole bunch of other kids with their pants and boxers around their ankles and their dicks in their hands, masturbating furiously.

There were three guys at each of the urinals, one on each toilet and two more standing in front of each. There was another pair at each of the two sinks, and at least fifteen spread out across the floor. They all groaned as they shot their loads across the room.

"It's a jack off epidemic!" Jason stood wide-eyed as his dick stretched hard against the fabric. He quickly dropped his jeans and plaid boxers and began to jack himself off in the doorway.

More guys pushed against him, trying to get some privacy to jack off in. He felt three dicks strain against his back.

He felt his dick grow larger and larger as more guys pressed against his ass.

Then he woke up. He looked down at the puddle of sperm in his hand, then quickly pulled his boxers back up and laid down to sleep.
by HornyGuy2 March 3, 2009
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The act of consuming apple jacks cereal.
Robby walked in on me jacking off last night and asked if he could join in.
by Pirate Suite January 21, 2008
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applying lubricant to the penis, then rubbing it slowly up and down while viewing images of attractive woman naked or engaging in sex acts. In time, the rhythmic movement will lead to a build-up in excitement. At this point, your sister and her best mate will walk in. It'll be too late to stop and a sticky whitish fluid will shoot out onto your computer screen. The girls will close the door and you will be left in a state of profound shame.
I was jacking off to pictures of Carmen Electra when the nuns walked in.
by Samantha Fox October 22, 2007
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