Niggas don't know me, I'm Detroit's king nigga, bow!!

from Royce Da 5'9" (Ft. Eminem) – Rock City Lyrics on Rap Genius

Meaning

He is saying that most of the people outside of Detroit don’t know who he is. He is just emphasizing it for them, since everyone seems to think Eminem was, but even Eminem called Royce the king of Detroit on their version of Renegade.

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