The 'Yokoso! Kira Kira, Doki Doki, Mochi Mochi, Puyo Puyo, Waku Waku, Wasshoi!' meme originates from the mobile rhythm game 'Project SEKAI: Colorful Stage! feat. Hatsune Miku.' It is the signature self-introduction of the character Emu Otori, voiced by Hina Kino. The phrase is a chaotic string of Japanese onomatopoeia describing various 'sparkling' and 'exciting' feelings. It became a viral sensation within the anime and rhythm gaming communities due to Emu's incredibly high-pitched, enthusiastic delivery. Online, the meme is used to represent ADHD energy, overwhelming excitement, or moments of pure, unadulterated 'brain rot' where words are replaced by colorful sounds and vibes.