Short reaction phrases like that's it have become a staple of online editing because they can end a clip without any extra explanation. Creators pair the line with fails, arguments, and everyday frustrations, letting the two words stand in for a shrug, a surrender, or a decision to stop. Its appeal is its versatility: the same delivery works as comedy, exasperation, or a deadpan sign-off, depending on the footage before it. Because the clip is under three seconds, it also fits easily into reels, shorts, and message replies, which has kept it in circulation as a quick, reusable punchline.