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Interjection: omigod
Usage: informal
  1. Expresses extreme surprise, shock, dismay, awe, etc.
    "Omigod, you have to come in so I can get my camera";
    - oh my God [informal], my God [informal], omigosh [informal], ohmigod [informal], ohmygod [informal], yow [informal]

Encyclopedia: Omigod