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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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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a sexual act that may or may not be popular with trans women, according to Miranda Bellweather in Fucking Trans Women #0 muffing is the sexual act of penetrating one or both of the inguinal canals.
I LOVED muffing her last night
by censation December 14, 2010
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Verb (past tense): To lightly or forcefully push the back of someone's head whether aggressively or as a gesture of endearment.
by Bridgetspace January 7, 2009
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When you get up in the morning and your eyes are crusted shut and you know you should not go on your phone but you do it anyway.
Dude, why are you muffing at 6:00 clock in the morning.
by One off handle June 9, 2020
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