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1) Buttmuck - When you don't wipe well after a dump, you see Buttmuck stains on your tighty whities.
2) Buttmuck - You go to sit down on an old couch and there's an undefinable smear. More than likely, someone else left their Buttmuck on that old couch.
You: "Hey, what's this stuff on your couch?"

Your friend: "oh, someone apparently sharted and left Buttmuck on my couch!"
by haykeydammit September 21, 2009
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