I got Bobby by the pound, Whitney by the key
DJ Screw by the gallon, bitch the game belong to me

from UGK – The Game Belongs To Me Lyrics on Rap Genius

Meaning

He is repeating the hook for emphasis, even though he is rich now, he is still the same hustler he always was, he will continue to sell Weed (or bobby) and Cocaine (or whitney) while sipping Lean (or DJ Screw), until the day he dies.

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