One who cannot stop saying the word "Nigga" descriptively in normal conversation. This does not apply to one who uses the derogatory word "Nigger" in general conversation. That person is a "Racist" not a "Niggaholic". Origin: Comedian,Paul Mooney on "Keith Olberman's Countdown" referred to himself as a recovering Niggaholic, meaning in the past he used the word frequently but, currently doesn't use it anymore.
Example common sentence used by a "Niggaholic": (What up Nigga, did you see that Nigga last night, at the Nigga spot, Niggas were actin' up on some ghetto Nigga shit!).