The underground is Koch, nigga. There is no underground nigga.

from Childish Gambino – Centipede Lyrics on Rap Genius

Meaning

Since underground rappers have been getting a lot of praise/recognition in the mainstream, that cancels out the underground entirely, since the point of being underground is being hidden completely from the mainstream!

Some of these borderline mainstream/underground rappers include Big K.R.I.T., Joey Bada$$, Tech N9ne, Ab-Soul, ScHoolboy Q, Cory Gunz, Danny Brown and Action Bronson, among others…

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