To creep through the back door, the typical black boy in the good old USA

from Ab-Soul (Ft. Danny Brown & Jhene Aiko) – Terrorist Threats Lyrics on Rap Genius

Meaning

Black folk in America have always had to sneak or force their way into opportunity. The front door’s never open so we’ve got to sneak in through a window, or in this case, the back door.

It’s also a statement on how society views an average black kid — a thief. It’s supposed to be a fucked up statement.

This can also reference the previous line, saying that he used to sneak out of his house unbeknownst to his mother.

Also a reference to the Jim Crow Era practice of making African Americans pick up/eat their food in the back rather than with the normal customer.

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