Mandatory Ugly Friend
Every woman has a MUF
viết bởi Junkyardjimbo88 27 Tháng sáu, 2003
someone who does not know the meaning of the word is a muf, until you know what it means you are one.
fred: "what's a muf"?
george:"you're a muf"
viết bởi youre a muf 21 Tháng mười một, 2010
An acronym for the very serious disorder: Messed Up Face Syndrome.
"Ew that was the ugliest girl I've ever seen in my life."
"Yeah, she has a bad case of MUFS"
viết bởi elly zass 28 Tháng mười một, 2009
Material Unaccounted For
"The missing nuclear waste is MUF"
viết bởi Randy Piper(aka Shit Goose) 21 Tháng ba, 2005
MUF -

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.
1)

Girl 1: HAHAHA Did you see Jenny today?

Girl 2: Yeah, i mean what a MUF!

2)

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.
viết bởi MCLIV 14 Tháng một, 2010
Multi User Forth

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.
Zirik wrote a program for underwater realms in MUF and inexplicably drowned the entire population of the MUCK.
viết bởi Zirik 18 Tháng tư, 2005
Material Unaccounted For

Usually a term referring to forsaken nuclear materials. MUF is also something that black marketeers happen to get their hands on. Scary...
"MUF?"
-Solid Snake

DAVE GROSS'S (that's me ^_^ ) EDITTED VERSION:
"MUF? You mean pussy?"
-Solid Snake
"No you nitwit!"
-Kenneth Baker
viết bởi Dave 30 Tháng ba, 2004

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