The “poi” meme sound is widely associated with Yuudachi from Kantai Collection, a character known for ending lines with “poi.” That verbal tic helped the clip spread through anime fandom, remix videos and short reaction edits online. Its staying power comes from how compact and recognizable it is: one syllable that instantly signals anime humor. It is often used the same way creators use Tuturu or other short character catchphrases, especially when a scene needs a cute but slightly absurd button.