The matter left behind on the toilet seat from a previous person. Weather it's.... s**t, hair,sweat, anything with pigment. (Usually men). Any type of matter that provokes you to clean and or sanitize the damn thing prior to use. It F**king DISCUSTING , not to mention RUDE.
--"What's wrong honey?"
- "Someone left Ass Crumb's on the seat again"
--Silence
- "So discussing"! (cringe)
a bum crumb ass nigga is that one nigga who thinks they the shit but actually fucken ass at everything they do, video games, school, and hell, even making friends. You can tell if somebody’s a bum crumb ass nigga if they wear their beanie at the top of their head with the top of the beanie all raggy n shit. They also wear baseball caps backwards and sitting on the top of their head so that they seem to have a tall head, bc their heads are small and their brains are small, and end up looking extra retarded.
Person 1: damn yo Damian is a fucken bum crumb ass nigga
Person 2: what do you mean?
Person 1: I mean just look at how this bum ass nigga wears his hat! Wtf!?
Dumbass: oh my god guys, this joke has gone to far, (shows random definition on urban dictionary that has nothing to do with the conversation).
Literally everybody Else: Bro shut yo fuckin crumbly lookin ass up