Used to describe people who emit so much black energy that even the actual black niggas question them "How they got so much niggerism in them??". Even the blackest people can't possibly rival the niggerism in your friends or others if they ever acted like a nigger.
When people from italy, sicily, greece, albania, crete, ect look like negros because of the high concentration of negroid genes mixed into they're blood. Puerto Ricans are in a similar situation called Carribean Niggerism.