Yatta comes from Airi, a character in Blue Archive, the anime-style mobile role-playing game where players lead a school academy and collect student characters. The word itself is a common Japanese exclamation meaning done it or I did it, which fits Airi's cheerful personality in the game. Fans clipped the short line for edits, gacha reaction videos and soundboards, where its brevity makes it easy to reuse. It remains popular because it is instantly understood even without translation, working as a universal sound for a small win in gaming and meme content.