A rare disease in which your butt crumbles into pieces from being butthurt. There are several stages at stage 5 you will need to operate at stage 9 you will need the iron butt and at stage 11 there's nothing more that can be done for you god have mercy on you soul.
Person one: Have you talked to Josh lately?
Person two: nah, that guys Crumblebutt is like stage 11.
Person one: more like crumbleasshole that fucker can't take a joke.
Cumbleberry: When your girlfriend goes out and gets another mans load shot in her. and tries to clean up with toilet paper and comes home and you eat her out and you get a mouth full of cumbleberries.