Short appreciative voice clips like this circulate on user soundboards as quick reaction buttons, shared because the phrase works without any context. The spelling ou thats nice reflects how the clip is titled and searched for by users who heard it in a video and want the exact moment for their own edit. It has stayed in use because it fills a gap between silent approval and over-the-top celebration, offering a mild, friendly response that fits family-friendly edits, streams and comment-style videos where a big reaction would feel forced.