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1.
Alternate slang for the act of masturbation or "fapping" but using diarrhea as lubricant.
Jack N. Off: "Masturbating is getting too expensive these days. I can't afford KY."
Ijer Kit: "Start crap fapping. Diarrhea is free, isn't it?"
by Ching Mang Wong February 16, 2009
 
2.
A take on "holy crap." But in this case, more to do with self-masturbation. Used when someone does or says a complete lie or exaggeration to make self better than he/she seems.
Joe: I have a weekend job.
Jim: Oh yea? I volunteer at the shelter. What do you do?
Joe: *thinking hard on his feet, makes something up* I'm a burlesque dancer named Emerald Princess. I do all this for charity, of course.
Jim: ... Crap Fap.
by KatoDado September 06, 2009