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RE: Crypto Collectibles presents The Sandman, a Cyberman, and a Stormtrooper for Doodle Doodledayeo Round 13 - Dream Cyber Sci-Fi
According to PopDust
The Flintstone Flop, originated on the 1965 Flintstones episode “Shinrock-a-Go-Go,” is a dance craze inadvertently created by Fred in which one flops clumsily onto the floor.
You can see this displayed in this clip
Maybe I will make a gif of Sandman doing it lol.