SMG4 is a long running Australian web series created by Luke Lerdwichagul, built around Mario game characters in parody adventures on YouTube. Clips from its episodes are frequently cut into single lines and shared on soundboards, where a one second greeting can travel far beyond its original scene. The what's up line fits that pattern, spreading through meme culture as a reusable entrance and reaction sound rather than a full quote. Its appeal is its brevity and recognisability for fans who know the series' fast, chaotic humour.