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It is when a person does not take a shower for a few days and has taken a few dumps and leaves dried pieces of shit behind on the toilet bowl
I went to take a dump and some nasty fucker left ass crumbs on the toilet bowl seat
by Carl Hard October 17, 2008
A small piece of poo clinging to the ass or the Underweare/Pants...

Often refereed to as a Dingle Berry
Jay's Got Ass Crumbs
by Raven2099 May 14, 2008
a really dumbass person. ie, an unemployed male that gets all the really good looking women.
Damn, look at that women...she is hot as fire...and with a fucken ass crumb.
by John Buzan November 28, 2007