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

     

    boner

     noun
    noun
    BrE BrE//ˈbəʊnə(r)//
     
    ; NAmE NAmE//ˈboʊnər//
     
    (North American English, informal)
     
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  1. 1(taboo) an erection of the penis
  2. 2an embarrassing mistake
  3. Word Origin early 20th cent.: from bone or (in sense (2)) from bonehead, + -er.
See the Oxford Advanced American Dictionary entry: boner