noun
- a stupid or careless mistake
Usage: informal
Examples
- He made a real boner when he forgot his wife’s birthday.
- The politician’s boner during the debate cost him votes.
- That was quite a boner – you sent the email to the wrong person.
- She pulled a boner by wearing white to someone else’s wedding.
- The accountant’s mathematical boner led to serious problems.
- Don’t make the same boner I did when filling out the form.