When get up from pooping, and there's a little piece of shit still in your ass.
"So I got up from taking a shit, and I had a pooty booty!
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Kind of like swamp ass, but just a long-time buildup of poo funk or leakage. See definition for gooch grease
Man we've been playing Minecraft for 17 hours straight and I got pooty booty, lemme go wash my ass real quick