Mettaton is the flamboyant robot television host in Undertale, the 2015 indie role-playing game created by Toby Fox, where he stages elaborate showdowns and treats every battle like a live performance. His exaggerated Oh yes became a fan favourite because it sums up his showbiz personality in two words, and players began clipping it for edits, streams and reaction videos. As Undertale's fandom kept growing through fan art, memes and playthroughs, the line travelled beyond the game itself. It remains popular because it is instantly recognisable, easy to place and always sounds like a cue for applause.
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Mettaton's flamboyant Oh yes voice line from Undertale, used by creators for dramatic reveals, glamorous entrances and over-the-top reaction moments in edits.
This short clip captures Mettaton, the flamboyant robot show host from Undertale, delivering his signature Oh yes with theatrical confidence. The voice is bright, smooth and deliberately dramatic, rising with a playful smirk that makes the two words feel like a spotlight moment rather than a simple agreement. Lasting just a few seconds, it lands instantly and gives an edit a burst of showbiz energy, turning an ordinary reveal into something glamorous, cheeky and self-aware. Listeners recognise the character immediately, even without visuals, because the delivery is so exaggerated and unmistakably Mettaton.
