Mufflefuck Share definition Flag 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. Mufflefuck by Raccoon Runt January 22, 2009 0 0 Get merch Get the Mufflefuck mug. Buy Now — $32.95 See more merch