Son it's in my chromosomes to rock this, I got this
Watch this! Assemble mo' raps, tap your pockets

from Yasiin Bey – Next Universe Lyrics on Rap Genius

Meaning

It’s in his “genes” to rock this flow as ill as him. Notice the topic is about “genes” and he tells you to tap your pockets like “jeans”, essentially he’s saying he gets money from rapping.

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