O gitu is everyday Indonesian speech rather than a line tied to one famous film or character, and its appeal comes from how naturally it fits online reaction culture. Short reaction clips like this spread through meme pages, short-form video edits, and chat groups, where a brief spoken response can carry a whole joke without explanation. Because the phrase is short, expressive, and easy to reuse, creators keep reaching for it whenever a scene needs a moment of dawning understanding, gentle mockery, or amused surprise, keeping it useful long after its first viral uses.