Any number of poolboys, cabana boys, lifeguards, etc. who work in or around water and whose sexual orientations range from ambiguous to flamboyantly homosexual.
"All these tropical buttfish are deflating my sails."
or
"He's a totaltropical buttfish. He hit on Mrs. Windham's son last night at the luau."
A word that pertains to someone or something that "kicks butt".
However, recently, the word has devolved to be used as a noun, adjective, verb, and even an idiom. In reality, buttkicker is simply the grammarically incorrect way of saying "kicks butt".
Sam: When your friend tries to make good roasts but then ends up failing: buttkicker.
Tom: STFU Sam you degenerate that isn't how you say it.