Shit I kept low, petro' your metro

from LL Cool J (Ft. Canibus, DMX, Method Man & Redman) – 4, 3, 2, 1 Lyrics on Rap Genius

Meaning

He layed low then applied petro'(petroleum which is used to make gasoline, kerosene and oil) to your metropolitan(inhabited area), which basically yet cleverly means he will blow up your spot which means show up to your home and make a scene.

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