Definition of boner in English:

boner

Syllabification: bon·er
Pronunciation: /ˈbōnər
 
/

noun

1North American informal A stupid mistake.
More example sentences
  • 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.
2North American vulgar slang An erection of the penis.

Origin

early 20th century (originally US): from bone + -er1.

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Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict