Abbrieviation of "Make-Up Failure".
For those girls who slap on the bronzer, and foundation, for those girls who have abnormally rosey cheeks, and for those girls who have eyes as black as the night.
Girl 1: HAHAHA Did you see Jenny today?
Girl 2: Yeah, i mean what a MUF!
Boy 1: I fancy some girl in my maths class... but i don't know what to do, she's such a MUF.
Boy 2: NO MAN, you can do so much better.
Advanced coding language used on MUCKs. When used by Zirik, it causes flooding.
MUF is frequently used when MPI proves insufficient to perform a desired function, as it has much greater capabilities. However, most consider it more difficult to learn.
Usually a term referring to forsaken nuclear materials. MUF is also something that black marketeers happen to get their hands on. Scary...
DAVE GROSS'S (that's me ^_^ ) EDITTED VERSION:
"MUF? You mean pussy?"
"No you nitwit!"