Rocket News 24 tells us that this is called shokkiri--a comedic sumo performance. This is not a serious match, but a carefully coordinated and rehearsed routine between men who are masters of both sumo and physical comedy. I've selected a few choice scenes and turned them into animated .gifs.
Patty cake, patty cake, baker's man . . . .
Next, on Dancing with the Sumo Stars . . . .
You'll get the Road Runner someday.
Now is the time on Sprockets when we dance!
All we're missing is Larry and Shemp.
I told you to sit down.
The referee, like Rodney Dangerfield, can't get any respect.