A stupid person.
More example sentences
- Meanwhile, down in the sewer, the mouth-breathers are already calling for them to be prosecuted for terrorism.
- I was almost trampled by a herd of mouth-breathers, apparently in the grip of some kind of snack frenzy!
- Forget all the mouth breathers in the audience, how do I feel about the record.
Definition of mouth-breather in:
- The US English dictionary