I used to move snowflakes by the O-Z
He used to deal cocaine, which is white and fine like snowflakes by ounces (oz). He is saying he moved cocaine by the ounce to denote that he moved so much blow that you would be better off measuring it by the ounce instead of the gram. The ounce isn’t used for cocaine because its not granular enough for an expensive product unless you’re a huge player who can’t be bothered with amounts so small.
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