A B-stache belongs to anyone sporting a moustache reminiscent of a stache found in a B-movie, especially an 80's B-movie. The bestowing of a B-stache is often enhanced by naming a specific B-movie or B-movie actor that the B-stache most closely brings to mind.
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
When a male is banging another in the poo poo hole, then pulls out and marks his lover with his feces coated dick on the upper lip in a pattern not too dissimilar from the mustache sported by Adolf Hitler.
When a bull dyke doesn't quite have enough testosterone supplements to grow a real mustache so they get something tattooed above her (it's) lip. WARNING: These will usually be seen in conjunction with tear drop tattoos, notched eyebrows, and names tattooed on the neck.