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The act of having sexual relations with your car or car parts such as a muffler
Dude: Have you seen bob latly?
Dude2: No but he told me he was goin' to muffle-fuck his girlfriends car.
by Mr.Trips ( jacob barile) November 28, 2007
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1. Two sheets fucking.

2. Something two friends make up in the early hours of the morning.
Mello: Are you denying me mufflefuck?

Near: Yes, I am denying you mufflefuck.
by Raccoon Runt October 11, 2008
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The act of stifling your sex noises so your children in the adjoining room can't hear how mommy likes to be spanked and called a whore
The kids have been home all thanksgiving break. I'm tired of having to muffle-fuck every night so they don't hear us.
by Kbee405 November 25, 2017
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