The greeting comes from SpongeBob SquarePants, the long-running Nickelodeon animated series, where Patrick Star is SpongeBob's cheerful, slow-witted best friend. Short lines like this one travel easily because they are instantly recognisable even without any picture, so creators reuse them as quick greetings, openings and reaction beats in memes, short videos and edits. The friendly tone keeps it useful for light, playful content, while other moments from the same show, such as a SpongeBob Fail, are used when a joke needs a clumsy or unlucky payoff instead.