I ain't stepping out of shit, all my paper's legit

from Jay Z – 99 Problems Lyrics on Rap Genius

Meaning

Jay-Z is saying that all the paperwork the cop might have hoped to get him on is kosher (and gives no probable cause) including a valid license, not just whether the car was purchased legally.

He is also refusing to step out of the vehicle because if he does, the police officer could possibly search the vehicle if Jay-Z does not close and lock the door.

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