The clip comes from K9Kuro, a VTuber and streamer known for loud, expressive reactions during live broadcasts. Short moments like this armpit smell bit are clipped by fans and shared as standalone reaction sounds, separate from the original stream context. Online, it survives because the disgust is universal and easy to apply to unrelated footage, from hygiene jokes to awkward social moments. Its specificity makes it funnier than a generic gag sound, so editors keep reusing it as a quick shorthand for something smelling terrible.