When I pulled up, police was on the scene
Had to make the U-turn, make sure my shit was clean

from The Notorious B.I.G. (Ft. Diddy) – Me & My Bitch Lyrics on Rap Genius

Meaning

When B.I.G. saw the police he had to turn around so that he could get rid of any illegal drugs or weapons he was carrying, as to not get himself in trouble.

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