Top Definition
Mandatory Ugly Friend
Every woman has a MUF
av Junkyardjimbo88 27. juni 2003
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"
av elly zass 28. november 2009
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"
av youre a muf 21. november 2010
In radio transmission Maximum Usable Frequency (MUF) is the highest radio frequency that can be used for transmission between two points via reflection from the ionosphere ( skywave or "skip" propagation) at a specified time, independent of transmitter power. This index is especially useful in regard to shortwave transmissions.
I am trying to reach Europe on the 10-meter band, but the MUF 20.25MHz
av Klinkou 14. januar 2015
Material Unaccounted For
"The missing nuclear waste is MUF"
av Randy Piper(aka Shit Goose) 21. mars 2005

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.

Girl 1: HAHAHA Did you see Jenny today?

Girl 2: Yeah, i mean what a MUF!


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.
av MCLIV 14. januar 2010
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.
av Zirik 18. april 2005

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