a gross mustache typically grown but douchebag guys who think that it's nice to shut doors on and ignore girls. and who like to go to business class still drunk.
when a guy gives his girlfriend head while she's on the rag. if her flow is heavy, he should have a nice smudge of blood on his upper lip, giving the effect of a mustache.
dude, i got the most gnarlycase of tampon stache last night when i was at michelle's!