Conor McGregor -- Nate Diaz Is Just Another 'Ugly Mexican Southpaw' (VIDEO)

Conor McGregor's mouth is already in prime condition as proven by the shots he took at Nate Diaz during the UFC 202 news conference.

They came together in Las Vegas and Conor had plenty to say about his preparation for their August 20 rematch. In typical McGregor fashion he said he'd been sparring for a "tall, lanky, ugly Mexican southpaw.

Of course, both fighters commented about Jon Jones getting 86'd from this weekend's UFC 200. Nate kept it brief, and pretty shocking, saying ... "Everybody's on steroids."

Check out the video ... Conor was more sympathetic to Jones -- but also boasted he could step in for him and fight Daniel Cormier, if called upon.