Video: Xzibit Pops Off On A Rapper! Slaps Him & Throws A Chair!

Screwing with Xzibit is not recommended -- 'cause the "Pimp My Ride" star chucked a STEEL CHAIR at another rapper's face ... allegedly over a cab ride!

X to the Z was backstage at a concert Wednesday night in Adelaide, Australia when he got into it with a concert promoter/rapper named Mastacraft.

According to reports ... Xzibit's ride from the airport wasn't up to his standards -- and after he got to his hotel, he was forced to hail a cab to the show when the promoter went M.I.A.

Just watch what the explosion once X got to the show and ran into Mastacraft backstage.

The promoter says Xzibit was treated like a king and any claim saying otherwise is BS, but still -- the video is crazy!

Xzibit allegedly threw a chair and slapped the promoter of his Adelaide gig during an extraordinary backstage tirade at the Uni Bar on Wednesday.

Sources tell Confidential they saw the former Pimp My Ride host lose control just before taking to the stage at his solo show, becoming involved in a heated argument with security and local promoter Patrick Whyntie.

X wasn't having It!!!!!

He put ni**as under pressure!

SOURCE