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1.
A jewish person who acts like a rapper. From platinum + names like goldstein, etc.
Did you see David's new Bentley? That shit's straight platinumstein!

Or "That Platinumstein just bought 22s"
by Uncle Arvin July 31, 2004
 
2.
A jewish rapper, or a jewish person who is really flashy like a rapper.
That platinumstein's new track is tight
by Your Granddad July 31, 2004