I'm trying to stay grounded like four flats
But I know flats and Piru Crip tats

from Kendrick Lamar (Ft. Dr. Dre) – Compton Lyrics on Rap Genius


He’s saying he wants to stay “Down to Earth” meaning he doesn’t want his success to go to his head and change who he is as a person.“Four flats” is a car with four flat tires, which wouldn’t be able to go any where hence “stay grounded”.

The next line he’s saying he knows “flats”, a local gang from Compton which ties in with “Piru Crip tats”, as they’re a neighbourhood gang loosely associated with “the Crips”. Also, notice the contrast from “flats” to “Piru Crip tats” two completely different types of people.

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