Bob Esponja is the Spanish name for SpongeBob SquarePants, the animated television character introduced in the Nickelodeon series in 1999. Online, “keseso” is used as a humorous compressed spelling of the Spanish question “¿qué es eso?” The phrase became useful in reaction edits because it instantly communicates puzzled disbelief without needing extra context. This version circulates as a standalone meme audio for Spanish-speaking audiences. Other SpongeBob sounds, including the SpongeBob sad song and the “My leg!” Fish clip, remain popular for similarly recognizable cartoon reactions.