Markiplier, the online name of American YouTuber Mark Fischbach, built a huge gaming audience with his loud reactions and his opening line about being Markiplier. A playful fish version of that intro helped this yes yes shout circulate as a standalone reaction clip on soundboards and in fan edits. It spread because the voice is instantly identifiable even without video, and the escalating delivery fits countless excited moments. The clip remains popular with fans who use it as shorthand for enthusiastic agreement and overblown celebration.