it's on like Donkey Kong

slang Used to indicate intense readiness, eagerness, or anticipation for something, especially a competition or confrontation. A variant of the standard phrase "it's on," used with "Donkey Kong" (a popular video game character) as an intensifier and because of the slant rhyme it creates. He said what behind my back? Oh, it's on like Donkey Kong! The coach got everyone on the team hyped up before heading out onto the field. We all knew it was on like Donkey Kong!