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A mufflestein is a woman with a muff (vagina) so hairy that it strikes fear into the hearts of men unfortunate enough to have seen it. She is well past the point of being a simple "muffy" and most likely has a hairy asshole as well.
Random #1: That girl's a muff.
Random #2: No, man, she is THE muff. She is Mufflestein.
by UDFlyer September 02, 2007
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