Mermaid's Purse
A Mermaid's Purse is when an individual defacates into a womans vagina, the woman then hovers over the face of the individual and lets it fall onto his or her face.
John and Linda wanted to spice up their relationship so during sex, he took a hot, steamy, crap in Linda's vagina and she reciprocated by giving John a Mermaid's Purse.
mermaid purse
slang for vagina
"Oh Laura, don't tell me you're gonna let that dude get inside your mermaid purse just because he changed your tire?"
Mermaid purse
When you are in a body of water such as an ocean and a man lays his penis on ur shoulder like a purse strap
Oh look at that mermaid purse! It matches your outfit!