when something gives up nigga vibes. To be more exact "nigga" in this context is not "black people", its the difference between JOHN LEGEND and NLE CHOPPA if you get what I mean. Also, people from any race, not necessarily black can be niggatistic.
Anything that a nigga would probably do. like after they score a touchdown they gotta do some crazy celebration. or putting huge rims on a car. anything nigga'd up. etc.etc.etc.