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Interjection: yippee  yi-pee [N. Amer], yi'pee [Brit]
Usage: informal
  1. Exclamation of joy or victory
    "She took a step backwards and began to jump up and down yelling, 'Yippee! Yippee! Yippee!'";
    - hooray, hoorah, hurrah, hurray, whoopee [informal], yahoo [informal]

Encyclopedia: Yippee, Yappee and Yahooey