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1.
(adj) someone who acts very slick and clever.

Combines the words "Fly" (Kool in a ghetto like manor) and "Fish" (an aquatic creature with gills)

word can used to describe someone that you think just said something cool and/or funny.

*NOTE:

Make sure that the person you call a fly fish knows the definition or else you will sound like a douche bag.
Gabe: "Yeah, me and Channy were kicking some ass in World at War last night."

Austin: "hahahahahaha-you said 'duty'!"

Gabe: "OH, YOU FLY FISH!"

Outsider: "You guys are queer"
by Punk's Dead, You're Next! March 26, 2009