An adjective that can describe either a person or a thing that one greatly approves of.
Originating from the South, the term fye is simply the word "fire" with a heavy southern accent added. "Fye" and "fire" can be used interchangeably as adjectives in this sense, depending on the preference of the speaker.
Describing a thing:
"Damn, these burgers are FYE!"
s are FIRE!"
Describing a person:
"You see that girl over there? She's lookin FYE today."