This Japanese reaction sound spread online through anime meme edits, short videos and captioned reposts that use the phrase when something feels heartless or wildly unfair. Even when viewers do not speak Japanese, the tone clearly communicates disbelief and emotional damage, which helped it travel across platforms. It remains popular because the line is short, expressive and easy to drop after a harsh plot twist, toxic play or merciless punchline. The clip is usually treated as a reaction sound rather than a long quote from a scene.