Listed as Casbi voice line number four, this clip circulates as a short reaction sound built around the phrase you idiot. Its exact source is not widely documented, so its popularity comes from how it is used online rather than a known scene. Creators drop it into meme edits, gaming fails and chat replies where a blunt insult gets the point across faster than an explanation. The brief runtime and clear delivery make it easy to loop, layer and recognise across different videos and soundboards.