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When a guy (with a mustache) goes down on a girl and she has/gets her period while he's eating her out causing the residue to get on his stache.
Guy #1: Freddy ate Jenny out last night.
Guy #2: How do you know?
Guy #1: He came out with a Bloody Mustache.
Guy #2: That's just ... wonderful.
by Adrianaaaaaaaaa. December 10, 2010
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