Online, this short Spanish phrase works best as a reaction sound rather than a full conversation clip, and that is why it keeps appearing in memes, edits and chat replies. The humour comes from the blunt simplicity of the denial: no explanation, no backstory, just a flat refusal to know Alex. Because the line is short and easy to understand in context, creators can drop it into almost any awkward question, rumour or name-drop without needing subtitles or setup. Its vagueness is part of the joke, since listeners can imagine a different Alex every time.