Forgive my ignorance, but what is FAP? I've mis-placed my de-coder ring.
If I'm to work off Adam's demonstration of "fap", it would be a sound generated by beating the shit out of your junk with one or both hands?
Printed copy · Anthology Volume 5, page 690Printed copy from The Tender For Law Anthology, Volume 5, page 690 (printed 13 June 2014). Added by this site; not part of the Facebook export.