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.
by HornyGuy2 March 03, 2009
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jacking off

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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Jack off

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
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Jack Off

To masturbate.
Can also be used to unexpectedly shock people.
Grandma caught her 15 year-old grandson jacking off (masturbating) and she passed out, had a massive heart attack and died.
by chikillanto August 23, 2003
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jack-off

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 24, 2003
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jacking off

Causes Pleasure and Anger. The pleasurable part is pre-ejaculation. The Anger part is post-ejaculation. This is the part where the man becomes mad at himself for wasting 30 minutes of his time. The world suddenly becomes clear and the chemical imbalance is one again balanced. Too bad no man learns this lesson and history repeats itself.
I had a great time jacking off, up until the end.
by Patrick April 24, 2008
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jacking off

rubbing the penis so he spits up his cum
what I'm doing as I'm writing this, oh man just ejaculated everywhere
by I'm jacking off September 07, 2003
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