Mettaton is the glamorous robot television host of Undertale, Toby Fox's 2015 indie RPG, where his catchphrase 'OH YES!' punctuates his showy in-game dialogue. The game itself has no voice acting, so this voiced rendition comes from fan culture: impressionists and animators gave the line its campy purr, and it became a staple of Undertale memes, edit audios and TikToks. Years after release, the fandom still drops the clip to celebrate fabulous moments, keeping Mettaton's stage persona alive online.