The sound is tied to Ludoviko, a character associated with GoAnimate videos, where exaggerated cartoon voices were a staple of user-made comedy. Short clips like this wah were lifted from those animations and shared on soundboards, where they took on a second life as reaction audio for memes and edits. Because the scream is so brief and instantly readable as panic, it works without context, which is why creators keep reaching for it for fails, surprises and deliberately overdramatic moments.