Undertale is an indie role-playing game created by Toby Fox and released in 2015, known for its turn-based battles where timing and impact sounds sell every attack. This hit effect spread beyond the game through YouTube edits, memes and soundboards, in the same way the ROBLOX oof became shorthand for cartoon damage and the Doge bonk became shorthand for a comic head hit. Its short length and clear attack makes it easy to loop into edits, which is why it remains a go-to damage cue for gaming creators years later.