Green’s Dictionary of Slang

filled to excess with the characteristics of the rebellious black antihero.

1974		Village Voice (N.Y.) 11 July 23: I had a .22 in my bag because I was headed for the New Lots and them muh-fuhs are superbad.
1978		D. Hebdige Subculture 162: The word ‘punk’, like the black American ‘funk’ and ‘superbad’ would seem to form part of that ‘special language of fantasy and alienation’.
1996		P. Beatty White Boy Shuffle 113: The flashy, superbad, black businessman-pimp approach to empowerment.