A person with the ability to rile up and / or manipulate people of African decent by either words, actions, or promises . Usually these are false-promises, lies, and unfair representation. Commonly for a political agenda

Guy 1: Why do all the black guys do what Guy 3 says?Guy 2: He is a Negromancer, he tells them what they want to hear and they do what he says, even though he almost never does what he says.