a mustache that a faggot (homosexual),or the facial hair of a French or Asian male, yes even beards and goatees that would typically cause one to look very gay. Most prominent being the handle bar mustache.
Guy1: hey man did you see the new guy at work today?
Guy2: yeah he had the gayest fag stache ever
Guy1: yeah I know it was weird because he didn't look French or Asian
Guy2: wow that is really weird
Guy1: hey you wanna do some lines in a 7/11 bathroom