I'm just a Chi-town nigga with a Nas flow

from Kanye West – Dark Fantasy Lyrics on Rap Genius

Meaning

He’s comparing his rap style to that of Nas, an East Coaster (does Kanye have region envy?), while punning on the word nice with his Midwestern (Chi-town = Chicago) lilt.

Notice the irony in the line: Kanye is just a Chi-Town nigga with a Nas flow. A “nigga” with a flow like Nas' isn’t just a nigga!

This line is reminiscent to Common’s line in “Southside”, which featured Kanye:

Back in ‘94 they call me Chi-town’s Nas
Now them niggas know I’m one of Chi-town’s gods

It’s funny how a slight difference in pronunciation distinguishes a downplay (I’m just a nigga with a nice flow) from a self-celebration (I’m just a nigga with a Nas flow), and an ironic one: if you have a flow like Nas you aren’t “just a nigga”. Most likely an intentional wordplay

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