boner - definition and synonyms

noun [countable] 

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/ˈbəʊnə(r)/
singularboner
pluralboners
  1. 1
    mainly American impolite a man’s penis when it is hard
  2. 2
    American informal old-fashioned a stupid mistake
     Synonyms and related words
  3.   From our crowdsourced Open Dictionary
    3
    an erectionSubmitted from United Kingdom on 04/12/2015