The phrase itself is everyday German for saying someone turned out well, and in this clip the humour comes from repeating and elongating it until it feels like a performance rather than a quick remark. Short vocal memes like this travel easily because the tone carries the joke even for listeners who do not speak German, and the drawn-out delivery makes it instantly recognisable in edits. It is most often shared as a reaction sound, dropped over proud poses, glow-ups and small victories to add a layer of playful, slightly exaggerated praise.