The phrase comes from everyday Brazilian Portuguese slang, where eita is a common interjection for surprise and peste adds comic emphasis. This short recording circulated on soundboards and in WhatsApp groups as a ready made reaction, valued because it is brief, loud and understandable even for viewers who do not speak Portuguese. Its popularity rests on timing rather than a single known source, with creators reusing it across gaming fails, prank clips and meme edits whenever a moment needs an instant shocked response.