(adj.) referring to a style associated with many gay men that puts strong emphasis on neat personal grooming, fashionable clothing and effervescent social interaction; sometimes generalized to refer to gay males in general.
(Coined, as far as I know, by my ex-wife, an actress, as a code of sorts shared with her circle of gay male friends and picked up by her many straight friends, as well.)
"Is that haircut shiny or what?"; "Don't go gettin' all shiny around me"; "Do you think he possibly could be, oh, I don't know....shiny?"