Rob Kardashian -- Throws Fat Stacks at Fiancee's Ass!!! (VIDEO)

Rob Kardashian is Blac Chyna's #1 fan, as he demonstrates in this mock strip club video.

Rob is probably used to Chyna's ass by now, but for him it's clearly still a sight to behold ... as she twerks and he chants, "Big Booty Judy."