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1.
(n) when you send out sexual explicit pictures of yourself in your underwear preferably skin tone color or if you receive these types of pictures.
Example 1:
Roy: "send me me those underwear n00dz bbygirl(;"
Roxanne: "hold up I have to strip into my underwear o;"
-Roxanne send Roy picture of herself in her underwear

Example 2:
Kyle to Dave: "did you see Amy's underwear nudes ?"
Dave: "yeah with the leopard-print bra and skin tone underwear"
Kyle: "she sends them to everyone, she's such an underwear slut"
by G.A.S & P.M.S. September 29, 2011