The line comes from Super Mario 64, released for the Nintendo 64 in 1996, during the boss fights where Mario grabs Bowser by the tail and throws him. Charles Martinet voiced Mario, and his energetic goodbye was widely misheard by players for years. The mishearing spread through forums, YouTube remixes and meme edits in the 2000s and 2010s, becoming one of the most quoted Mario jokes online. It remains popular because the original scene is iconic and the phrase works for any farewell.
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Mario's famous goodbye line from Super Mario 64, widely misheard as 'So long, gay Bowser.' Creators use it for funny goodbyes and dramatic exits now.
This is Mario throwing Bowser in Super Mario 64 and shouting his goodbye line, which generations of players have misheard as So long, gay Bowser. The delivery is cheerful, stretched out and instantly recognisable, with that classic Nintendo 64 voice acting echoing over the boss arena. It lands as a playful send off rather than a real insult, which is why it works so well dropped over anyone dramatically leaving, being thrown out or logging off. The humour comes from the contrast between the heroic moment and the absurd mishearing.