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1.
When you get pissed off at something so much that masturbating is the only way to relieve the intense anger.
"Dude I failed a test I'm gonna' go rage fap."

"Fuck this. I don't want to argue with you, I just need to rage fap."
by A-Dawg Halvie October 02, 2010
 
2.
When you are so angry and horny, you begin to fap furiously, but right before you come, you punch the tip of your penile instrument, causing the same effect as if you were to put your thumb at the end of a garden hose.
When tkmr plays a first person shooter, and repeatedly gets spawn killed, he gets so angry he suddenly rages out, then furiously ragefaps.
by tkmr June 23, 2010