Muff Diver

Muff diver is a piece of sexual slang for someone who performs oral sex on a vulva, with muff being an old colloquial word for the pubic area. It has circulated in lesbian and queer communities as well as in broader casual speech. Depending on tone and setting it can be playful and affectionate or crude, and it has sometimes been used as a taunt. The phrase is informal rather than clinical, so it belongs to jokes, flirting, and everyday conversation instead of medical or formal writing. Like most sexual slang, its feel depends heavily on who is saying it and to whom.