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.
The scrotum of a dog after its testes have been removed via surgical neutering. Merriam Webster and Oxford differ on whether a Mermaid’s Purse that has been refilled with neuticles still qualifies for the definition.
After getting neutered, that previously manly Maltipoo, Sea Bass, is little more than a rabbit, popping around the yard with that Mermaid’s Purse.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi