If I say that I'm flipping the bird, it doesn't mean that I'm putting my middle finger up

from Royce Da 5'9" – Acapella Lyrics on Rap Genius

Meaning

“Flipping” is another way of saying sell. “Bird” is another slang term for cocaine. So Royce isn’t saying fuck you when he “flips the bird” he is referencing that he is selling cocaine. He has similar lines in other songs to where you can tell it’s true:

I spit coke the eight balls in the corner pocket

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