Bio-mess

An euphemism for diarrhea-shitting through your sweat pants while driving a rental car.

Yo, Enterprise is gonna be pissed. You know that Toyota Yaris I rented to drive to the anime and furry convention? Bro, I straight up left a bio-mess in that B. Not sure if I should tell them and risk being charged a shart fee or just clean it up as best I can and hope they don't notice the smell.