151 
3 
MP3 다운로드 
The exact original source of this line is not widely documented, but the phrase has circulated online as a short spoken roast used to mock immature behaviour. Its appeal comes from its simplicity, because almost anyone can imagine saying it during an argument or playful teasing between friends. On short-form video platforms, creators reuse it as a quick reaction sound over fails, arguments and overreactions, where a single line can summarise the joke without extra explanation. That repeatability has kept it in rotation as a go-to comeback clip.
이 사운드에 대해
A sharp spoken line saying you're not even mature yet, used in memes and reaction clips to call out childish behaviour in a funny, dismissive way.
This clip delivers a blunt, teasing put-down in a confident spoken voice, with the emphasis landing hard on mature to make the insult feel final rather than playful. The delivery is short and direct, almost like a friend calling someone out mid-argument, which is why it lands so well as a reaction. Played over a gaming fail, a silly argument or a clip of someone acting childish, it instantly frames the other person as the immature one. It does not need context to work, because the tone alone tells the listener that the speaker has already won the exchange.
