The French word meuh is the written form of a cow's moo, and this stretched meuhhh version circulates online as a short reaction sound rather than a clip from a film, show or song. Its appeal is simple and visual: the sound is instantly recognisable even without context, so creators reuse it to label something dumb, slow or anticlimactic. Because it lasts only about three seconds, it fits neatly into memes, short-form edits and chat reactions, and it keeps resurfacing whenever a new joke needs an absurd animal punchline.