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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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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when a person gets knocked to the head with an extra heavy blow(also see murked).
I muffed him with my bat after I found out he stole my stuff.
by antoinette fleming February 19, 2003
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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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