Apparently, this pose and others like it reference the ED to a JDrama adaptation of some manga.
https://vimeo.com/187538552 (from the one-minute mark onward).

Aevrus said:

Apparently, this pose and others like it reference the ED to a JDrama adaptation of some manga.
https://vimeo.com/187538552 (from the one-minute mark onward).

It's called the koi dance.