Top Definition
When you're eating a girl out on her period, and when you stop your upper lip area has blood on it
Dude your breath smells terrible. What's more, did you get punched in the nose? Your lip is bleeding.

Nope, my girl is ragging and I ate her out so it's my menstrual mustache.
by jrudeboy February 19, 2014
5 Words related to Menstrual Mustache

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