The sound comes from the Super Smash Bros 64 grand finals at Super Smash Con in 2015, where commentary captured the moment player Boom secured a triple during the match. The exaggerated, letter-by-letter delivery made the short reaction easy to lift out of context, and it spread through Smash highlight reels, memes and soundboards as shorthand for any rare three-in-a-row feat. It endures because the disbelief feels genuine, and because a triple is specific enough to be funny while still working far beyond Smash itself.