A cosmetic-reconstructive surgical procedure in which the doctor makes you look like an African-American. As seen in the television show South Park, season 9 episode 1. The surgery is completely cosmetic though, you don't actually become black; a joke in the episode was that since he wasn't actually black, the boy who received a negroplasty couldn't play basketball otherwise his kneecaps would explode.
Doctor Biber: "Hello there son I hear you want some sort of reconstructive plastic surgery "
Kyle: "Well doctor I want to be tall and black."
Doctor: "*silence...* oh you mean you want a negroplasty!"
Bill: Hey did you hear Gerald had a Negroplasty?
Francis: yeah he's trying a new scheme to get his wife to have sexwith him again.
Bill: LOL good luck with that that pussies been mine for several weeks now.
german word for the surgical procedure negroplasty, that makes you score higher in basketball. similar to dolphiplasti. become anything you want to be. It's a fairly common procedure, really, just the reverse of a caucasioplasty just like Michael Jackson had.