The line comes from Rocky (1976), spoken by Mickey Goldmill, Rocky's trainer, in the dressing room after the final fight against Apollo Creed. Rocky refuses to accept defeat, and Mickey's barked line became one of the film's most quoted moments. It spread through sports highlight edits and meme compilations in the 2010s as shorthand for refusing to quit, and it still appears in gaming and fitness videos today. Editors often pair it with the Fatality sting for fight knockouts and with You What for shocked reactions.