The exact origin of this stretched what scream is not documented, so it circulates online purely as a reaction clip rather than a credited scene. Short soundboards and meme edits helped it spread, because the single word needs no context and the long delivery works even on mute in a viewer's imagination. It remains popular with creators who need an instant, exaggerated response to surprises, bad news or nonsense, and its five second length gives editors room to layer it over a pause, zoom or slow reaction shot.
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That stretched-out what scream sound effect of a shocked voice yelling in disbelief, used for reaction videos, edits and meme moments of total confusion.
This clip is a single voice dragging out the word what into a long, rising scream that keeps getting louder. It starts like a stunned question and quickly turns into pure disbelief, with the stretched syllables making the reaction feel bigger than the moment deserves. The humor comes from the excess, because such a huge vocal outburst is usually dropped over something small or confusing. Viewers instantly read it as shock, protest and disbelief at once, which is why editors use it as a punchline when a scene suddenly stops making sense.