The clip is listed as a vtuber sound under the name Pool Loop, with the Chinese label 返祖, meaning atavism or a return to an earlier trait. That label explains its online use more than any single scene does: it is shared as a compact reaction for moments that feel like a throwback rather than a new development. Short vtuber clips like this travel easily between streams, short-form videos and edits because they are instantly recognisable in context and do not need a long setup to make sense.