Ilia Topuria just gave Nelk Boys haters an absolute treat -- the current UFC lightweight champion didn't pull any punches in sparring sessions with the YouTubers ... resulting in some hilarious content!!
The group posted their workout with the champ to their YouTube channel Wednesday ... and as you would expect, they got their asses handed to them.
The first victim was Steiny. Topuria backed him into a corner and laid some light hits before he fell. He did get back up .