Poi is the signature verbal tic of Yuudachi, a destroyer in Kantai Collection, the Japanese browser game centred on anthropomorphised warships. She ends sentences with the word, and fans adopted it as a shorthand for the character herself, repeating it in fan art, videos and online jokes until it became recognisable even outside the game. The sound survives because it is instantly quotable, easy to drop into a short edit, and tied to a beloved, energetic character whose playful personality matches the tone of the clip.