Ronda Rousey -- Destroys Guy On The Ellen DeGeneres Show (VIDEO)

Don't push Ronda Rousey unless you're looking to get slammed to the ground ... that goes for guys too.

The executive producer of "The Ellen DeGeneres Show" -- Andy Lassner -- learned that lesson the hard way when he got a little too chummy with the UFC champ ... seeming to get under Ronda's skin after giving her a push before their demonstration.

She didn't just take him down, she performed her famous armbar on him ... getting him to tap out a couple of times after he was unable to break free from the painful move.

She really is the best.