Cowabunga became the signature catchphrase of the Teenage Mutant Ninja Turtles, most closely linked to Michelangelo in the animated series that brought the heroes to a mainstream audience in the late 1980s. The word itself came from earlier surfer slang, but the Turtles turned it into a shout of excitement before leaping into action. It spread through toys, cartoons, films and games, and later through memes and short-form videos, where a single shout instantly signals Turtle-style fun. Fans still use it because it is short, instantly recognisable and tied to childhood nostalgia.