The line comes from SpongeBob SquarePants, the long-running Nickelodeon animated series, where SpongeBob is the cheerful sea sponge who lives in Bikini Bottom and Gary is his pet snail. Short clips of SpongeBob calling to Gary have circulated on soundboards, reaction videos and social media as a lighthearted way to mark a sudden appearance or reunion. Its appeal has lasted because the characters are widely recognised and the delivery is instantly cheerful, making it easy to reuse across memes without needing any context from a particular episode.