When you barg in to the bathroom when someone is taking a shit, and slap their bare ass and thighs until they are red. All the victim can do is scream like a girl, because no one wants to fight when they are naked and shits dangling between their legs.
Ow! My ass still stings from when my brother Crap Slapped me. Next time I shit, I'll lock the door
When you inadvertently walk into a lingering fart or when someone intentionally leaves a fart cloud for you to walk in to, you've experienced a crap-slap.
Jesus that stinks...thats the worst crap-slap I've ever smelled!