The Danjo meme originates from the 2008 J-pop hit 'Danjo' by Taro Kobayashi, which quickly became a viral sensation on the Japanese video-sharing site Nico Nico Douga. The song's rhythmic repetition of 'Dan' (man), 'Jo' (woman), and 'Danjo' (man and woman) inspired countless hand-drawn animations and 3D character loops featuring various pop culture figures performing a synchronized dance. It is primarily used to categorize groups of people or concepts in a playful, rhythmic manner. Over a decade later, the meme remains a beloved piece of internet history, often used for nostalgic throwbacks or to showcase character dynamics in fandom communities.