Adj: - derogative term - Someone of a lower (or no) class – Usually found in large packs in city centres – can be of any age (although motherhood stats at 14) – standard attire – Tracksuit bottoms – fake Burberry caps – jewellery from Elisabeth Duke of Argos. Derived from the fact they breathe through there mouths.
1; the mouth breathers stood in the dole queue.
2; the mouth breathers considered Primark to be an expensive shop.
3; the mouth breathers were unfamiliar with the concept of books or chewing with ones mouth closed.
door Andy The Great 21 juli 2003

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Top Definition
1. literally, someone who lacks enough intelligence that they never learned to breathe through their nose.

2. a really dumb person.
In his latest work, the director has forsaken the indie audience and made something for the mouthbreathers.
door hedgerow 3 september 2003

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A stupid person who breathes through their mouth, like P Diddy.
P Diddy is a mouth breather
door ===0) 29 december 2004

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1. Someone who is incapable of breathing through their nose

2. Someone stupid who is unaware that their mouth is gaping open, often taking in gallons of air and spewing their own dry, bacteria rotten maw into your clean air in your vicinity.
Never let a mouth-breather speak to you very close, or you might regret it.
door Randall Wynn 6 april 2008

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A person who breathes through their mouth, thus having their mouth hang open. Their mouth can be anywhere from barely open, to gaping, and usually the more open it is, the more idiotic, and unintelligent they look. Mouth Breathers may or may not be intelligent, however, due to the fact that they don't realize their mouth is gaping, they just look like a moron, who may drool at any moment, but is deffinately sucking in as much air as possible.

Mouth breathers tend to be people who are bored, zoning out, very focused on something, someone with huge lips, or someone who isn't smart enough to realize their mouth is hanging open, catching flys. All tend to appear as the latter.

People who are sick and can't actually breathe through their noses do not count.
Katie: "I was sitting in class, and I looked over at Fred, who was staring dead eyed at the board with his mouth hanging open, like an idiot"

Rachel: "Ew, what a Mouth Breather"
door JelloLove 15 september 2010

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A subspecies of Homo-sapiens known for their lack of any intelligence whatsoever. Their young are raised entirely on a diet of Ribena and Chicken Nuggets, whilst the adults have no interests other than Stella Artois and ITV2.
Dude, did that mouth breather just trip over his own foot?
door sugarcoatedGandhiman 10 februari 2011

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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.
door Douglas Page 22 februari 2005

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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.
door SheckyGrl 17 januari 2016

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