Mettaton is a robot entertainer from Undertale, the 2015 indie RPG by Toby Fox, who transforms into his glamorous Mettaton EX form mid-battle while hosting a deadly gameshow. His 'Oh yeah!' catchphrase punctuates the fight and became one of the game's most quoted lines. As Undertale grew into a massive fandom, clips of the line spread through YouTube compilations, TikTok edits and meme videos, where it now soundtracks reveals, transformations and victories. It endures because few game quotes deliver campy confidence as efficiently as Mettaton's.
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Mettaton EX's 'Oh yeah!' voice line from Undertale, the flamboyant robot's iconic catchphrase. Perfect for dramatic reveals, transformations and meme edits.
The clip captures Mettaton EX, Undertale's glamorous robot showman, belting out his signature 'Oh yeah!' in a bright, theatrical synthetic voice. The delivery is pure showbiz swagger — punchy, sassy and dripping with confidence, with an electronic edge that makes it instantly recognisable. Hearing it triggers an immediate rush of campy excitement, like a spotlight snapping on before a big reveal. It lands as a hype injection in any edit, turning an ordinary moment into a dramatic entrance and giving viewers a knowing jolt of nostalgia for one of gaming's most flamboyant bosses.
