The phrase who invited this kid has circulated online as a general put down for someone who feels out of place in a group, game, or conversation. As a soundboard clip, the extended kids ending turned the line into a reusable reaction that creators lift and drop into edits without needing the original context. It spread through short form videos, streams, and meme edits where a sudden unwanted arrival is the joke. Its appeal is simplicity, since the wording alone explains the attitude and works across gaming, school, and party scenarios.