According to Stuart Scott it means "that which is freeky deeky" but it is used to mean anything similar to LeBron James. Always has a positive meaning.
King James got LeBronious on the Hawks last night.
Nick: My stat line read 22 pts, 15 rebs, 4 blks, 2 assts, and 2 stls.
Bob: Damn son you were pretty LeBronious
Andrew: Scary V is the best teacher, she's LeBronious
Bob: Yeah, she's the man