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 1, 2011
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
rubbing your boner for insane sexual pleasure
masturbation
I'm jacking off as I type this sentence.
by lolwhatisthis March 31, 2009
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.
by Marty October 20, 2003
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.