"Ugh, that guy is such a bi-mo!"
Tim: I'm bi-mo now.
Billy: Huh? What happened to being a gay goth?
Tim: Gay goth? That is so last Thursday!
Billy: Right...so when did you decide you liked sex with girls? And what's the difference between a goth and an emo anyway?
Tim: Sex with girls? Eeeeww!!
A double mo that occurs when no hair grows in the middle of the upper lip.
Horrified person: Holy moly! That dude has two caterpillars on his upper lip!
Slightly less horrified person: Nah mate, he's got a bi-mo, it's for Movember