This sound comes from Undertale, the 2015 indie RPG by Toby Fox. Players strongly associate it with the game’s soul-breaking death moment, which is why searchers often look for terms like Undertale broken heart and Undertale death animation. Over time, the clip spread beyond gameplay and into meme edits, where its quick, unmistakable crack became shorthand for losing, emotional damage, or a sudden defeat. It still gets reused because even a very short clip instantly reads as a failed run or shattered resolve.