Definition of whopper noun from the Oxford Advanced Learner's Dictionary

     

    whopper

     noun
    noun
    BrE BrE//ˈwɒpə(r)//
     
    ; NAmE NAmE//ˈwɑːpər//
     
    (informal)
     
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  1. 1something that is very big for its type Pete has caught a whopper (= a large fish).
  2. 2a lie She's told some whoppers about her past.
See the Oxford Advanced American Dictionary entry: whopper