To jerk off. Comes from the sound that is produced while a man is masturbating.
She didn't put out again, it's our third date. I think I'll just fap off.
by bitofafry November 4, 2013
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two begin to fap. one finishes. one continues.
there are two people who disagree about who can out fap the other and so they have a fap off
by The American American November 4, 2013
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Similar to the phrase "laugh it off", it's what you tell your friend when they're upset or frustrated.
Friend 1: "Man, I can't get over breaking up with her."

Friend 2: "You'll be alright dude, just fap it off."
by bosstin_twosix January 28, 2014
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