Place it at the very end of a failed run or a broken plan, after the action has stopped. Pair it with No God Please No just before it for a moment of disbelief, then let Roblox Oof mark the defeat itself before this clip closes the scene.
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This is a brief Undertale sound effect, just over three seconds long, made to mark a moment of loss or defeat. It carries a heavy, sorrowful feeling that settles quickly and stays with the listener, giving a scene a quiet sense of finality. Taken from the game, it works as a small emotional cue rather than a line of dialogue or a longer piece of music.