flamboyant cuttlefish

noun2

1. •
   A brightly-coloured species of cuttlefish, Metasepia pfefferi, found in tropical Indo-Pacific waters.

   • The flamboyant cuttlefishes (genus Metasepia) can flash contrasting patches of yellow, white, dark brown and red. — 2000
2. •
   (slang) A swimmer who wears flamboyant clothing, often as a protest or as part of an LGBT-themed swimming competition