Mongolian Chimney Sweep definition: The intimate act by which, after an extensive reaming of a ladies butt, you flip this lady ugly and poop. when a guy shits in a girls ass hole and then the guy scoops that shit out and she eats the shit he shat. Slang for mongolian chimneysweep. As you've probably noticed, the slang synonyms for " mongolian chimneysweep " are listed above. According to the.