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

5 Words Related to Muffle-Fuck

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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