Noun A double niggative describing that one white guy who tries to immerse himself in black culture.
White Guy #1: Ay yo homie, wanna go smoke weed at Kentucky Fried Chicken after some ballin'?
White Guy #2: Shut up Timothy, stop being a Negro Black Man. We all know you ain't black.
When a nigger tries to seduceweak and gullible ladies, with all kinds of lies, just to fuck her and dump her.
A negromantic would try to confuse women with negrowizardry and empty promises like:
"Baby, you mean the world to me! I will always be there for you! You're so beautiful!"
Right before he rapes them and ends up in the Maury show as the father.