"I'm gonna be a head catcher," Forrest said, describing the person standing at the ready behind slap competitors, waiting to pounce when an athlete's rocked.

Dana White recently launched Power Slap -- taking slap fighting from the underground to the mainstream. The UFC honcho already locked down a TV deal for his new organization.

Power Slap hasn't debuted yet, but if social media's any indication, there's tremendous interest in PS ... teaser videos online have gone viral!

If you've never watched the sport, competitors go back and forth, slapping each other with all their might until someone quits or goes to sleep ... and when they do get knocked down or out, it's important someone's there to stop them from hitting their heads and sustaining trauma.

Enter Forrest.

"That double impact," Griffin said, explaining why the job's so important ... "You’ve taken the first trauma and when your head hits the ground, bang bang, both sides of your brain actually bounce against your skull. We want to prevent that and make it just the initial impact and have that be what causes you or not causes you to win or lose the competition."

Of course, as a fighter, Forrest was the guy doling out the knockouts, not preventing them. He has wins over all-time greats like Tito Ortiz, Rampage Jackson, Shogun Rua and more MMA legends. Since retiring, he's dedicated his life to the health, safety and development of the UFC's athletes.

Needless to say, Griffin is the perfect person for the job.

Forrest even showed off some head-catching skills ... on 6'2" 200 lb. Evan (he looks familiar), a Power Slap exec.

All jokes aside, Griffin's doing everything in his power to make the sport as entertaining, but also safe as possible.