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The act of farting while you have chicken grease (mixture of butthole sweat and leftover poop) between your thighs.
Guy 1: Whats that smell?
Guy 2: haha that was my dirty muffler!
The juicy substance between your upper thighs (usually around the butthole). a combination of butthole sweat and leftover poop.
When you dont wipe good enough after your last shit, and then sweat from between your thighs.
Danny: Hey man whats that smell?
Phil: oh dont worry man thats just my chicken grease. i didnt wipe very well after my last shit! sorry bro.
Danny: you get that taken care of buddy