What is [sewer Monster]?
1.
The sluttiest mustiest foul-smelling girl at a party that one of your drunken friends hooked up with due to your encouragement that she was in fact attractive.
John, I can't believe you boned that sewer monster last night..I was just playin when i said she looks like Britney Spears. She looks more like Aries Spears...
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Sub-character on South Park, episode 501, where Scott sells Cartman his pubes for 10 dollars. After Cartmen learns from Kyle, Stan, and ..