We're on the corner serving that rock'n'roll, rock'n'roll, rock'n'roll
Posted on the corner with the rock'n'roll, rock'n'roll
Rock is slang for crack cocaine. Crack dealers typically post up, or stand, on street corners so they can serve not only their usual customers but randoms as well. Roll is slang for ecstasy so roll is a possible reference to ecstacy or MDMA but most likely not.
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