Mr. Belding -- I'm a Pro Wrestler Now!

Mr. Belding is a trash-talking ... stomach-kicking ... stone cold stunning PRO WRESTLER ... and TMZ has the video to prove it.

It all went down at an event in Jersey ... where 61-year-old Dennis Haskins was serving as host and guest enforcer for a Pro Wrestling Syndicate event called "Saved By the Ring Bell."

Belding not only whooped some ass ... he dragged his victim all around the ring and taunted him mercilessly ... while a masked man in a pink unitard egged him on.