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Noun. (vb. to mumf.)
Muffled shouting; the sound made by someone trying to speak or shout when they have something in or over their mouth (e.g. a gag or a hand). More commonly used in the form "mumfing" than "mumf."

First coined by Lobsterling in a Dirk Gently's Holistic Detective Agency fanfiction on Archive Of Our Own, 9/10/2020.
"With a hand clasped over his mouth, the swearing became a furious mumfing."
"Their words became mumfing for a good few seconds before they realised they could no longer speak."
"Thrashing in zir restraints, ze began to mumf frantically."
mumfing by Corvidiss October 23, 2020
Related Words

free muffing 

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.
free muffing by Gettn N Eiffel February 8, 2008

mulfinger 

to be great at something and to always rise above.
Steve tried to play guitar but hes no mulfinger.
mulfinger by Farrand March 11, 2007

Mudfinger 

The unfortunate result of ones finger breaking through toilet paper while wiping. Usually this is a result of inferior toilet paper.
Gus: Hey Peabody have you been working in the garden again? it looks like you got dirt under your nails.
Peabody: Geez errr that's just Mudfinger, Clarice needs to stop buying our tp at the five and dime, that shit is see-through.
Mudfinger by qochaka February 2, 2015
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
muffing by censation December 15, 2010

your muming 

Your muming is an urban game played from a vehicle. Usuall directed at chavs, townies or any group of yobish youths; your muming is a chance to return some abuse.

Whilst driving past a large group of the above mentioned sub-human species, the driver should slow down, and a passenger in the rear should roll the window down, and in a pretenscious snobbish voice shout "I say old chap, Your mum" at which point the driver will accelerate and depart quickly.

Your muming is an entertaining game, however participants should never conduct this activity in their own area, or else retribution may follow (If they can spell retribution that is) Please note this activity is only to be conducted against people who deserve it, attacking random members of the publinc in this manner will have you branded as low class chav scum
Your Muming: an activity for abusing people from a vehicle. But only people who deserve it.
your muming by Huggie Monster December 28, 2005