Ass Erosion
When someone's ass is hit so hard the skin flakes off their ass.
Dude 1: I caused some Ass Erosion last night!
Dude 2: How hard did you slap?
Dude 1: Harder than you can imagine.
Dude 2: No way!
Dude 2: How hard did you slap?
Dude 1: Harder than you can imagine.
Dude 2: No way!