A fork of Rural Dictionary
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.
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
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."