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1. ass crumbs
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
2. Ass Crumbs
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
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