And for the time being
I'mma be that nigga, believe that, nigga

from Earl Sweatshirt (Ft. Vince Staples) – Burgundy Lyrics on Rap Genius

Meaning

Earl is saying that he isn’t quite as big as he wants to be just yet. But he wants everyone to know that eventually he’ll get the fame he wants. And they better all be waiting for that day.

This line is also almost identical to “1991” by Azealia Banks.

I'mma be that bitch, believe that shit, believe that shit, nigga I'mma be that bitch

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