To completely screw up or to fail miserably.
Essentially another form of "messed up".
Dude, you totally Muffed out with your girl.

My man, you're totally Muffing Out right now.
by IHaveASmallPP August 13, 2018
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To smell like one hasn't washed for a few months.
Phooh, she's / he's absolutely muffing !
by Muffindamule October 1, 2006
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The act of performing oral sex on a woman who doesn't shave her pubic hair. Originated from the town of Muff, in Ireland.
"So what'd you get up to over the weekend?"

"Oh, nothin' much. Just a lie in, and a bit of muffing the wife
by Spoovo July 26, 2015
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To go deep underground exploring caves and potholes. An adrenaline fuelled activity conducted by "Muffers"

Muffer
Those muffers have been Muffing, that's exploring caves. They like to go in deep.
by Muffers-Rule September 3, 2015
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When your babe throws you the last condom and you drop it and it falls under the bed, killing your chance to score.
I was like the New York Jets last night - muffed punt and the game was over.
by Puntmuffer September 18, 2017
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When a woman goes without underwear - the female equivalent of free balling. Also called free buffing or going commando.
Half way through dinner, Jennifer told me she was free muffing and I couldn't get my mind back off of tagging her for the rest of the meal.
by Gettn N Eiffel February 8, 2008
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The polite way to describe somthing that is "fucked up"
Jack muffed up Jason's face after Jason attempted to finger Jacks mothers asshole while she was sleeping.
by scott January 30, 2004
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