Chinese Trots
Simply put, having an acute case of diarrhea where one is careful to keep the butt cheeks tight to prevent possible leakage while walking to the nearest facilities to release the Kraken.
Dude, did you see that chick over there walking kinda funny? I thought her hip huggers were just way too tight, but then I saw a green apple splatter on her ass. She must have the Chinese Trots...