Dirty Muffler Share definition Flag When a hot chick sits on your face and farts; drowns out moans and/or screams. I was 69'ing with Kim when she sat up and gave me a "Dirty Muffler". Dirty Muffler by Big L 11968 November 13, 2011 0 0 Get merch Get the Dirty Muffler mug. Buy Now — $32.95 See more merch