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Jack Off 

stimulating your penis with your hand to cause orgasm and ejaculation. Male masturbation.
Brian had the blue balls so bad he had to jack off as soon as he got home.
Jack Off by Marty October 19, 2003

jack off 

To play with your dick until you cum.
I had to jack off, because I had the massive blue balls.
jack off by Jack Balls May 11, 2004

Jack Off 

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.
Jack Off by Phillip Knowles January 19, 2006

jack off 

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.
jack off by HornyGuy2 March 3, 2009

Jack off 

Composed of two words, jack and off. See those for the individual meanings.
I helped my uncle Jack off his horse.
Jack off by N. 1. August 26, 2006