This clip comes from Undertale, the 2015 indie RPG by Toby Fox, and features Mettaton, one of the game's most theatrical characters. Because Mettaton is closely tied to performance, glamor, and exaggerated delivery, the line spread easily in fan edits and reaction memes. It remains popular in gaming circles and character-based meme videos because a simple 'oh yes' can instantly signal confidence, camp, or a perfectly timed dramatic payoff.