frant26
Member
Interesting, never heard the "mouth breather" insult:
"Mouth-breathing" as slang for stupidity
From the condition of a "mouth-breather" it is but a short step to one of two results—more often both: deafness, and that peculiarly stupid, sleepy, inane, foolish expression of countenance so characteristic of the "mouth-breather". (1892)
"Mouth-breathing" as slang for stupidity