Same as a necromancer, but instead communicates with spirits of black people rather than spirits of dead people, better known as the art of negromancy. Also gives better use to the term "black magic". Oh yeah, and he's black.
-You're a negromancer!
One who practices 'Black Magic'. i.e. is capable of seducing European women, often by the use of ancient magic potions such as Rohypnol.
N1: I see that nigger has bagged himself another whitey, know what I'm sayin'?
N2: Like yo. Dat nigger is one sweeeet Negromancer, he's gonna romance her good.
N1: Although technically it's considered rape.
N2: Quite so.