Definition of boner in English:

boner

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noun

North American
  • 1 vulgar slang An erection of the penis.

  • 2 informal A stupid mistake.

    • ‘unfortunately somebody pulled a major boner on this one’
    • ‘The Consumerist will highlight the persistent, shameless boners of modern consumerism - and the latest hot deals, discounts, and freebies around.’
    • ‘The Times corrections culture seems to revel in correcting every misspelling, transposed digit, historical inaccuracy, and boner.’
    • ‘They were there to trap me into some kind of boner.’
    • ‘There are also a couple of bad physics boners on their website - for instance, the claim that certain celestial radiation sources are made of ‘dark matter’.’
    • ‘For both these reasons I should not have felt too much chagrin if it were pointed out that I had made a boner in the course of my mathematical and logical discussion.’
    • ‘I realize that I made a "boner" of a mistake, but why punish me by taking money out of my wallet?’
    mistake, error, blunder, fault, gaffe, slip, slip of the pen

Pronunciation

boner

/ˈbōnər/ /ˈboʊnər/

Origin

Mid 19th century (originally school slang, in the now obsolete sense ‘a blow to a bony part of the body’): from bone or (in boner (sense 2)) bonehead, + -er.