Really nigga

[Justin Bieber]

When some stupid ass person does something retarded

[Becky]

really nigga is a phrase used when someone says something dumb or obvious

[Donald Trump]

Expression of disbelief (= when you have just perceived or heard something you can hardly believe). Mostly when an action occurs that could have been avoided.

This expression can be spoken to anyone, however its mostly used and recommended to be used when being in company of friends who do not necessarily have to be Africans or Afro Americans.

[Justin Bieber]

Someone says somthing stupid