Full phrase: "What crawled up your ass and died?" It is said after somebody farts and the smell is so horrible that everyone in the room runs out gagging. The implication is that the fart smells as bad as, for example, a rotting dead skunk or maggoty rat.
Todd's fart was so overpowering that Ben said, "Man, you stink! What crawled up your ass and died?"
by lyndal June 1, 2007
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Alice: Oh wow! Did you hear that cardinal?

Jack: Yeah, annoying little prick.

Alice: What crawled up your ass and died?
by OrvilleFan December 18, 2019
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Term used to describe an unusually bad smelling fart. The implecation is that the fart smells like a rotting animal combined with shit.
Damn, John, what the hell happened? It smells like something crawled up your ass and died!
by Waycoolrich August 8, 2007
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