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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To be heavily intoxicated and/or high.
Mikey- Dude did you see John at the party last night?

Tyler- No why?

Mikey- He was muffed!

Tyler- Damn!
by Lil Beetch May 3, 2011
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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.
by Zirik April 18, 2005
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This is when a woman has been given pleasure by her partner through oral sex.
by John Tong April 22, 2005
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A derogatory word used to describe simultaneous oral sex between two lesbians, often referred to as 69.
Susie hasn't gotten any all week. Tonight she's getting drunk and going out muffing.
by Mr Muff April 8, 2007
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