8
A nearly wiped out ethnic group of humans who breath very noisily through the mouth only. Major causes of death are from suffocation while: giving blow jobs, eating, or attempting to breathe from the nose.
1. Alex almost suffocated yesterday while eating; he must be a Mouth Breather.
2. Sadly, Alexis suffocated while giving Mr. Andryszak a blow job. She was the last female Mouth Breather.
by Douglas Page February 22, 2005
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The only thing these crude, rude, and obnoxious people have in common with the human species is that they have a hole in their head with which they breath; otherwise, they are pretty much amoebas with vocal chords.
check your local pool hall in any small southern town
by lee ann hansen January 06, 2004
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10
The actual meaning of Mouthbreather is someone who has a deviated septum and therefore has trouble breathing through the nose. But people misunderstand the reason that they breathe through their mouths and misintepret it as an insult and don't realize that it is not their fault.
Poor John has a deviated septum and can't breathe very well through his nose. He doesn't have enough money or insurance for the surgery, so he has to endure all the insults and is labeled a mouthbreather
by Frostivers February 04, 2009
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11
1) Person incapable of their own thought, who when faced with a decision, or when asked about personal opinion on something opens up her or his mouth in shock and astonishment that there is such thing as personal opinion. With mouthbreathers it happens constantly due to damage caused by upbringing by helicopter parents, or other emotionally damaging authoritarian or social influences. Can be spotted at every step of social and economic status ladders.

2) A reason why normal people invented law of the land ( equivalent of pinning a note that states "anyone who will touch my coffee cup will get their car keyed" ) and lawyers to herd those idiots away from harming normal families.

3) Equivalent to an alarmist or a zombie - AVOID AT ALL COST - prolonged exposure might lead to compromise of inner emotional barriers and contamination of own soul with emotional AIDS. If you really want to help such person you can only put some objects in their way in hope it will trigger aha moment in them, so they will start slowly doing stuff for themselves - pretty much the same deal as when handling alcoholics. When engaging personally with help there is high chance of them making their mess your business, continuing their crazy of not doing anything for themselves.

4) Private Pyle from Full Metal Jacket after emotional fuckery by Gunnery Sgt Hartman
me (at university): So mr advisor, is what I wrote in thesis valid and does it have your okay stamp?
advisor: No, you gotta change thingie A to B
me: umm... but why? the whole world is doing A. B is kinda retarded way (provided metric shit ton of references)
advisor: No, you gotta change A to B
me: (oh fuck... im dealing with a mouthbreather here...) okaaaay, so can i post that on my blog so the whole world will know you are in favor of B?
advisor: (says nothing)
me: so, can I now assume that A stays and all is kosher?
advisor: *okay*
me: THANK YOU! (sigh... finally)

(true story)
by Spaceship Earth Astronaut November 16, 2012
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12
Any person who is so stupid that they don't have the ability to breathe out of their nose.

A person who cannot cut over a 35 on their ASVAB.

Somebody who's lower lip is so big that it can be caught on a trip wire due to the over breathing through the only orifice they know how to breathe out of.
Mike isn't quite a Glass Licker, however we'll give him the status of Mouth Breather because he got a 25 on his ASVAB.

Josh is a Mouth Breather. His girlfriend, who's been sleeping around with half of the state, has him fooled into believing they will get married.

Josh says he gets 5,000 dollars a month hauling milk... what a mouth breather.
by Randomus August 25, 2006
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13
1. A term used by intolerant people or by the elite, who find some need, probably from a lack of self esteem, to marginalize someone whose opinion differs from their own. Usually they would define a mouth breather as someone who is to stupid to "get it". A a socially backward individual.

2. Someone who suffers from allergies or other condition that prevents breathing through the nose.
These days, someone who supports President Bush or the NRA, would be described by liberals as a mouth-breather.
by Mover March 21, 2004
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14
A person of low intellect who is incapable of critical thinking. A mouthbreather watches Fox News religiously and believes everything they hear there as well as anything on the Internet that validates their ignorance.
Donald Trump appeals to every mouthbreather in the country because he is as ignorant and unimaginative as they are.
by SheckyGrl January 17, 2016
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