The action of slapping your junk/balls against your thighs to produce a sound.
Roommate 1: Dude, what the hell was that noise from your room last night!?
Roommate 2: Just me standing in front of the mirror slappin' out that flappywappins.
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.