pooper-potamus 

A fat women's butt

I would totally put it in her pooper-potamus

pooper-potamus by bfeezy83 December 26, 2019

pooterpotamus 

noun
1. a large vagina
2. a whiner

Derived from the rare African animal.

Keith won't get a tattoo, he is being a pooterpotamus.

Kristin has had sexual intercourse with many, many men. She has a pooterpotamus.

pooterpotamus by jkdizzle February 10, 2008