2 Chainz ARRESTED — Drugs at LAX … As In Sizzurp

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2 Chainz was just arrested at LAX … after cops allegedly found weed on the “I’m Uncommon” rapper as he was trying to board an airplane, TMZ has learned.

Sources tell us … 35-year-ancient 2 Chainz is currently being booked for possession of marijuana after he was trapped with pot in Terminal 5.

Just yesterday, 2 Chainz — real name Tauheed Epps — was tweeting about how…