Bloody Mustache
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.
Guy #2: How do you know?
Guy #1: He came out with a Bloody Mustache.
Guy #2: That's just ... wonderful.