And the feds know just what's in this motherfucker
Made niggas so they can't bust in this motherfucker

from Lil Wayne – Walk In Lyrics on Rap Genius

Meaning

The government knows that there is drug activity but there is a lot of firepower inside, so they don’t act. Based on New Jack City
http://www.youtube.com/watch?v=-RBYqGSb_70

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