This sound comes from the wave of voice-changer memes where ordinary recordings are pitched down and distorted until they sound demonic. In this case a baby's scream was processed through a voice-changing tool, giving it the deep, growling tone that makes it feel evil rather than just loud. Clips like this spread on soundboards and short-form video because they are instantly recognisable as a joke: the listener expects innocence and hears menace instead. That simple contrast keeps it in rotation for pranks, horror parodies and reaction edits.