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"
by elly zass November 29, 2009
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when someone sitting on a piece of furniture (couch) farts and stays sitting down (not getting up at all) causing the fart to be held within the furniture
Broski why does this chair smell like ass???

oh Elaine muffed...
by jamankita October 17, 2010
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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"
by youre a muf November 22, 2010
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A term describing something or someone is fucked up, but in a polite way, specifically, in public.
Dude, the other day, he tried something out and it was completely muffed up!
by Guilford309 July 12, 2011
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Jannette- "Did Liam stay in with his wife again?"
Nathaniel- "Ya, he's muffed."
by JoyRider August 26, 2009
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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.
by MCLIV January 14, 2010
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