You GS-3, I'm GS-4

from Cam'ron – Leave Me Alone, Pt. 2 Lyrics on Rap Genius

Meaning

I.e. you’re driving a Lexus GS3, and I’m riding a much more expensive and newer Lexus GS4. The following year, Cam would be past even those cars, and would claim “The only G4 I’m on is a laptop”

Note also that Cam twists the meaning of this line in the line following, revealing that GS-4 means not the car, but a Gulf Steam 4 private plane

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