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Mud fin is when someone passes gas, emitting some fecal matter that gets flattened out between their butt cheeks, poking out of the crack like a shark fin.
Steve could tell that last flatulence gave him a mud fin.
by Lazy Reggie July 05, 2013
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Apr 21 Word of the Day
I've been jabbed
by Francesco II March 20, 2021
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