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Mouldy ass 

when you don't wipe your ass & it forms a layer of mould in your ass crack, which smells & makes other people gag when they walk past.
Oh my god the seat smells, the last person who sat here must have had mouldy ass.
Mouldy ass by Sami D March 29, 2009

a bag of old and moldy ass 

This is a person who drank way too much the night before.
"Man I feel like a bag of old and moldy ass"

Moldy Leftover Ass lint 

Usaully you get it when you haven't bathed in a while and it collects in your crack and it suddenly becomes stuck with no way to get it out.
There's some in your crack.......