Krakatoa is the name of a real Indonesian volcano, also spelled Krakatau, famous for its massive 1883 eruption. In SpongeBob SquarePants, the long running Nickelodeon cartoon that began in 1999, Squidward Tentacles is SpongeBob's grumpy neighbor and coworker, known for losing his temper. His exaggerated shout of the name was clipped from the show and shared on soundboards and in meme edits, where the historical scale of the eruption makes his anger feel hilariously oversized. It remains popular as shorthand for an imminent, overblown outburst.