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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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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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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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
by Dave March 30, 2004
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Muffing is the new Mudding - since iPhone decides to auto correct everything!

- giggles
example: "Mo-reece is going muffing today in his friend's amazing Rubicon"
by Giggles124 April 8, 2013
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Does muffin have a muf on his muf

Sit on your muf.

Nice muf cutie lol fuck that one.
by This is the real muffin June 13, 2016
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Long established Royal Navy slang for cunnilingus.
Alternative: Muff diving.
The bosun's mate got caught muffing a split (female) sailor in the cable locker.
by BandyE May 9, 2016
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