bucootchie
Bucoothchie is a terrible smell of butt plus cootchie from a girl in her private area. It is often a mix of sweat and body odor, plus sometimes pee, poo/farts, and/or period smells.
I wanted to wear my pants again the next day because I'd only worn them an hour, but when I smelled the seat, they reeked like bucootchie so bad that I couldn't!