Throwing pubic shavings onto a girl's chest after shooting your load on her. Results in said girl's manic attempts to pull off shavings thereby mimicking the chest poundings of an angry gorilla.
Larry the Cable Guy on Blue Collar TV uses this as a sort of catchphrase. It's meaning is pretty much universal, but is mostly used as a way of agreeing with something enthusiastically.
Son: Hey Dad, do I plug in the leaf blower now?
Dad: GETERDONE!
Dude1: Dude, that chick is so hawt!
Dude2: GETERDONE!