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

Jakum had a boner in pe so he went to the toilet but when he arrived he saw a Jack off centre!

There were boys relieving themselves everywhere! He got his big dick out and jacked off ! He wanked his dick until he shot a load out !

A few minutes later the pe teacher arrived , his face droped but he joined in the wanking club. !
by yep9 July 20, 2014
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Jack off

Look at porn and rub your dick because you cant actually get any real pussy.
Zach cant get sex so he went to "jack off"
by hambone_shs94 July 30, 2009
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Jack off

A fan of "Jack Johnson"

Often seen wearing birks or sandals while chillin' in the quad with his backward-baseball-cap-wearing "BROS"
by genldick January 08, 2008
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jack off

reason my right arm is much bigger than my left
Kid to anothr kid: holy shit! look at his arm
another kid: omfg
(they sees his left arm)
kid: ohhhh.....he probbly jack off
anothr kid: lets add that to our arm workout bro
by jjtheblack October 01, 2011
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jacking off

When Spider-Man rubs his wrist using his hand until a white sticky substance is released, often called, "His Webbing". Spidey often uses this "Webbing" as a form of transportation among other things in order to save the day. This is why when Spider-Man isn't horny, the day does not get saved.
Person - "Help, I'm being robbed!"

Spider-Man - "*Frantically rubs his wrist and moans* Come on you son of a bitch!"

Person - "Is he jacking off?"
by Zaza the Crazy Rogue June 28, 2007
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Jacking Off

In Yu-Gi-Oh, when you use 2 Tuners and 1 non-Tuner to summon a Synchro Monster as opposed to the 1 Tuner and 1 non-Tuner
I can't believe he's jacking off into Red Nova Dragon.
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