Poopage is an event that takes place in an athletic or gaming situation. Poopage occurs when the skilled player/athlete "poops on" the opponent, usually in a manner that the "victim" didn't really have a chance. In Gaming it usually is something like a head shot or a juke move in a sports game. In Sports, poopage would describe a teabagging slam dunk or a nasty stiff arm or juke move.
1.) Me: Hey man watch this replay I do a sickass no-scope, after a pretty nice double kill.
(after we get to that part of the Halo 3 replay.)
Xbox Live Friend: HAHA omg that was insane poopage... you pooped all over that kid! (continued to watch rewind reangle the camera replay it until we were finally done laughing about it).
2.) Holy Crap did you see L.T. shake and bake that guy? That was total poopage! (continued to rewind on DVR and replay it in slowmo etc. etc.)