Definition of "superbad"

Whose[sic] gonna remember a black man unless he was a superstar athlete or a superbad criminal? Black men in America die like flies everyday,[sic] and no one cares. Hell, I doubt that I will live to 21.

2005, Kenneth V. Hardy, Tracey A. Laszloffy, Teens who hurt, page 90

Brian became my little brother; he was a superbad bluesman.

2003, Etta James, David Ritz, Rage to survive: the Etta James story, page 218