The excrement build up that accumulates when you don't clean your toilet for a couple weeks.
"We've gotta do something about the crapper – it's got poo gremlins."
by kong kong is long July 21, 2009
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The fictional gremlin that you imagine touching your ass as you poo into a dark smelly porto-potty.
Mark: Ricky I havent shit in 3 days!

Ricky: Why thats weird?

Mark: No its not, im just afraid of the Poo Gremlin touching my ass while I shit. Ill just wait till I get home.
by Mark Van Fucko June 4, 2011
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