Undertale is an indie role playing game created by Toby Fox and released in 2015, known for its turn based battles where timing and dodging shape every fight. Short combat effects like this slash became easy to lift from gameplay clips and reuse outside the game. As fan animations, edits and meme videos spread on video platforms, the sound turned into a shorthand for a sudden attack or cut. Its brevity keeps it popular with editors who need an instant hit without covering dialogue or music underneath.