I keep the streets so numb they call me "Novocaine"
I turn over 'caine over and over again

from Clipse (Ft. Fabolous) – Comedy Central Lyrics 1 on Rap Genius

Cocaine is a numbing agent, as is novocaine; Pusha keeps the streets numb by “turning ‘ova caine’”, i.e. “turning over” (selling) cocaine, which — like novocain — is a numbing agent

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