Bingo dot 

A spot left behind on a chair by anal or vaginal fluid.

I totally left a bingo dot on the chair at dinner.

Please deal with your leaky tampon so you don't bingo dot my car seat.

Bingo dot by TravelBaby April 25, 2011

Bingo Dotting

(1)Also known as prairie dogging, the act of nearly soiling oneself.
(2) When a turd slips out your ass and "dots" your underwear, but resides back into your anal canal. Thus resembling a dot on a bingo card.

"Shit dude, I have to poo so bad I'm bingo dotting my underwear."

Bingo Dotting by Tiffany J. September 29, 2008