Cause I'm ill bitch, they couldn’t make a pill for the rap

from J. Cole – Grown Simba Lyrics on Rap Genius

Meaning

Cole really likes to play on the meaning of “ill”: it normally means awesome, but he likes to say he’s so awesome that his illness is super powerful

E.G.: on “Back to the topic” he says

I’m ill enough to kill cancer baby I’m chemo

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