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UFC champ Conor McGregor called Nate Diaz a "cholo gangsta from the hood" in one of the most hate-fueled pre-fight press conferences ever.

Nate said everyone in the UFC -- including Conor -- was on steroids. Conor went nuts and said he was absolutely not.

Nate, who's stepping in at the last minute to replace the injured Rafael dos Anjos in UFC 196 on March 5th, was goaded by Conor, who said Nate "makes gun signs with the right hand and animal balloons with the left hand."

Conor was referring to Nate's side jobs to make money. Conor was quick to add he's now a millionaire who shops on Rodeo Drive.

You have never seen this kind of hatred.