The phrase comes from everyday Spanish, where que mentiroso is a direct way to call someone a liar, and the repeated ay ay ay adds a theatrical, teasing tone before it. As a two second clip it spread through soundboards and short video edits as a ready made reaction, especially in Spanish speaking meme culture. Its appeal is clarity: even viewers who do not speak Spanish hear the rhythm and understand the mocking intent. That keeps it in rotation for pranks, storytelling videos and chat audios where an instant call out is funnier than a written reply.