The phrase IDK what that means has circulated online as a shorthand reaction for confusion long before it became a standalone sound clip. As short form video and soundboards grew, users began isolating voice lines that said the reaction out loud, so it could be dropped into chats, edits and streams without typing. Its appeal is its plainness, there is no character or setup required, anyone hearing it instantly understands the speaker is lost, which keeps it reusable across school, gaming and everyday conversation contexts.