Ric Flair wasn't saying "WOOOO" after his recent run-in with Michael Chandler ... it was more like "OWWWW," 'cause the WWE legend was straight-up tackled to the ground!!
Naitch and the UFC star had an "altercation" at a bar recently ... and the footage of their wild trash-talkin' session that turned violent quickly spread on social media.
Of course, many rightfully suspected there wasn't any real bad blood between the two -- after all, they've starred in commercials for Car Shield in the past ... and actually have another spot dropping next week.