This cheer comes from Lightspeed Rescue on the Nintendo 64, a game built around the Lightspeed Rescue team, where a short yay marks a moment of success. As short gaming clips spread through soundboards and video edits, the simple, instantly readable celebration became a handy shorthand for any small victory. It endures because it needs no context: one bright shout tells viewers something good happened, making it easy to reuse across gaming, reaction and comedy videos.