I would use her shit for toothpaste - A way of saying she’s so gross you’d take a dump in your mou

A way of saying she’s so gross you’d take a dump in your mouth before using her poop for toothpaste.

I would use her shit for toothpaste because her breath smells like a dead rat.

She’s so ugly I’d use her shit for toothpaste over her face.

If I had to choose between her face and her shit, I’d use her shit for toothpaste.