Ko ko ko is the Russian spelling of the sound a hen makes, similar to cluck cluck in English, and short clips of it have long circulated as joke audio online. In messaging culture it became a quick teasing shorthand, especially in WhatsApp audios shared between friends to call someone a chicken without typing an explanation. Its brevity makes it easy to forward, loop and drop into edits, so it survives as a reaction clip rather than a song or a scene from a known film or show.