Who, what is the cos, what is the name for this little dance?

Was posted with no info here:
https://boards.4chan.org/cgl/thread/10911148

Anon: 10939699

::: spoiler Piefed.world does not have a way to upload webm natively. I used catbox. Sorry to those with region blocking. Vote against your fascist Puritan masochistic emotional austerity overlords if you haven't already.
:::