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I've heard the word "mouthbreather" frequently used as an insult, which I find baffling. Why is this considered an insult, and where does it come from?

Thank you. :-)

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"Mouth-breather" is used to imply someone of low intelligence, who perhaps isn't even smart enough to clear a blocked nose and so always breathes (loudly) through his mouth.

http://www.dictionary.com/browse/mouth-breather

As to why it's an insult, who can say? Why is it that if you call someone "a dog" it's bad, but if you say "my dog" it's good? "Pigheaded" means "unreasonably stubborn" but why? Pigs are actually very easygoing animals, especially when compared with cats (who can be incredibly stubborn).

Sometimes a phrase means something simply because that's how it's been used. Someone used it, it sounded appropriate, so others copied them. Over time it becomes part of the language.

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    Suggest slack-jawed which also indicates very little brain. Eating with the mouth open is one thing: living like that is another. – Weather Vane Nov 11 '17 at 23:03
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    @WeatherVane Yeah, "slack-jawed" is another that means "dim-witted" but without any good explanation for why other than "because". – Andrew Nov 11 '17 at 23:40
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    Pigs may be easygoing animals, but they are highly intelligent, and when they do not want to do something, they have the brainpower to avoid it quite intelligently. They also have a loud and piercing shriek that sounds distressingly similar to a human baby's cry (which is why it has such a profound effect upon us; we're biologically primed to react to it). Thus pigheaded not only means stubborn, but stubborn and highly vocal about it, too. – Omnidisciplinarianist Jul 27 '18 at 1:05
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With respect specifically to the term "Mouth-Breather," though this is not the only answer, a very compelling one is a genetic malady called Down Syndrome. Take this fine gentleman in the picture:

Young Man With Downs

As a sufferer of Down Syndrome, he and others like him have a tendency to suffer breathing problems. These cause many sufferers to favor breathing with their mouth as opposed to their nose (you can read more about it here if you'd like). You'd breathe with your mouth most of the time too if you had problems breathing through your nose.

Combine this with the sad fact that the malady reduces the average IQ from 100 to 50, and it becomes rather simple to draw the correlation of the term "mouth breather" being used as an insult.

Something to note: this malady has existed throughout human history. There are references to it going back to at least the 16th century, including this painting (The Adoration of the Christ Child, of which there are several versions, this one painted in 1515 and believed to show numerous subjects with what is now known as Down Syndrome):

The Adoration of the Christ Child

So the term "mouth-breather" has had centuries to build up its sordid reputation.

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I think that it may be a person that nonstop talks about other people's business that had been wished to be kept a secret. I assume that this is the reason because talking could also be assumed as breathing through the mouth because it is open on a regular basis. Here is an example:

"My best friend is a mouthbreather because she told everybody who I have a crush on!"

I may be incorrect, but this is what I assume. I have been told, however, that it is a term for someone with low intelligence, such an example would be:

"the child in my class is a mouthbreather, he didn't know any of the answers on his test!"

since this is one of the terms for "idiot" or "stupid" it would be fairly appreciated that no one is to be called this in your social or non-social life.

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