Yukkuri began in Japanese internet culture as a fan-made take on characters from the Touhou Project, redrawn as simple, blob-like heads with relaxed, cheerful faces. Their catchphrase, roughly meaning take it easy, helped the characters spread through fan art, videos and message boards, where the name itself became shorthand for the whole meme. Outside Japan the word is now recognised mainly as a soundboard reaction, used by people who know the reference even if they have never played the original games.