The sound comes from SpongeBob SquarePants, the Nickelodeon animated series that premiered in 1999 and stars Tom Kenny as the voice of SpongeBob. His eager, high pitched way of greeting other characters became one of his most recognisable traits, and short clips of the line were later shared on soundboards and in meme edits. Because the delivery is so instantly identifiable and upbeat, creators keep reusing it for entrances, greetings and ironic hellos long after the original cartoon moment.