(Freeze! Rock! Freeze! Rock! Freeze! Rock! Freeze! Rock!)

from Grandmaster Flash and the Furious Five – White Lines (Don't Do It) Lyrics on Rap Genius

Meaning

“Freeze” is slang for cocaine: http://www.urbandictionary.com/define.php?term=freeze&defid=525596

“Rock” is slang for crack-cocaine, which often comes in rock form.

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