I got Bobby by the pound, Whitney by the key

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

Meaning

I got all the drugs you need, Marijuana by the pound and cocaine by the kilo.
Bobby is a reference to Bobby Brown, the R&B singer whose music career was overshadowed by his drug problems. Wife Whitney Houston has stated publicly that Brown’s drug of choice was weed laced with blow. Whitney Houston herself did a lot of cocaine.

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