Where shit drys in your ass after its been improperly wiped and when you scratch your ass it falls out like dust and it gets all over the place.
by Eliott Johnson June 02, 2007
To administer a royal bumming...To open a can of whoopass on one's friend/nemesis/child...To give someone a jolly good thrashing at something, e.g. a computer game, or contact sport such as killing.
"You'd better not be trying to overtake me adey. I am the king of rollcage and I shall be making bum crumble if you aren't careful. you assmunch."
"Put that child down adey, you can't bring him with you or you'll get a fresh serving of bum crumble from that police officer"
"Put that child down adey, you can't bring him with you or you'll get a fresh serving of bum crumble from that police officer"
by Mighty O May 14, 2008
Bum crumble
A vigorous post-movement wipe following a particularly high-liquid content when coupled with cheap toilet paper peppered the seat with a light dusting of bum crumble - Alex aghast made his exit from the stall and returned to his desk, feeling still the warming reverberations on his cleftal horizon as a gentle reminder of his overzealous wiping.
by Fair_dinkum July 19, 2019