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"
ayon kay elly zass ika-28 ng Nobyembre, 2009
muf
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"
ayon kay youre a muf ika-21 ng Nobyembre, 2010
Muf
muf is your butt
Does muffin have a muf on his muf

Sit on your muf.

Nice muf cutie lol fuck that one.
ayon kay This is the real muffin ika-13 ng Hunyo, 2016
MUF
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.
ayon kay MCLIV ika-14 ng Enero, 2010
muf
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.
ayon kay Zirik ika-18 ng Abril, 2005
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