As above. Is particularlyimpressive when the buttocks and arsecrack are employed. The Australian "panel van" style of car is a favorite with exponents of this sport.
Someone spreads the cheeks of the butt against a piece of glass (i.e. a window) and proceeds to poop... it will flare out and look like a bowl of brown fruit that's been pressed against the glass
I was at a stop light and the woman next to me kept staring, so I dropped my drawers and showed her a pressed fruit bowl