Short repeated vocal sounds like this one spread easily online because they are instantly recognisable, easy to loop and simple to drop over almost any short clip. The uy chant is used most often as a light reaction rather than a serious line, which makes it a flexible fit for comedy edits, friend-group jokes and playful commentary. Its appeal comes from rhythm and repetition: listeners catch the pattern within a second, so creators can use it to signal teasing, surprise or mock disbelief without needing any explanation.