The song Ki Swui Kya by my band Century Egg talks about moments of switching into a child's mind, giving up frustrations that are not worth to deal with, and achieving the simple happiness and wisdom.
"Ki Swui Kya" is a fictional phrase with made-up characters that looks like the little dance appeared in the video, and sounds are like a karate kick. I came up with the sounds first by mixing several Chinese dialects, and base on that, I picked existing Chinese characters with similar pronunciations, then changed parts of their structures to resemble the dance moves.