Short vocal reactions like this long ooooh have circulated on soundboards and in meme edits for years because they say a lot in less than a second. The clip has no clear credited source or character attached to it, so its popularity comes from how creators use it rather than a famous scene. It works as a shared shorthand for impressed disbelief, teasing approval or mock scandal, and its tiny length makes it easy to reuse in vertical videos, streams and group chat edits without reworking the whole timeline.