'Sippin' on Syrup' Rapper -- Justin Bieber's Gotta Learn ... SIZZURP KILLS

Three 6 Mafia rapper DJ Paul -- famous for his song "Sippin' on Some Syrup" -- has some words of advice for Justin Bieber ... stay away from sizzurp, or you could die.Paul was out in Vegas this week when we asked him about the photos circulating of…

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