someone who is ignorant to the social courtesies of public movement. consequently, they stifle the mobility of thinking humans by becoming an obstacle which must be negotiated. they can be identified by their despondent facial expressions and wide-open mouths .
Man, I wish these mouthbreathers would get out of my f**king way! I hate people who don't pay attention to where they are going.
додав dee eye zee 20 Грудня 2008

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Someone who's been in too many fistfights and thus has had the ability to breathe through the nose beaten out of him. The usual implication is that the ability to use the brain has also been beaten out of him.
My bookie sent a mouth breather to collect for him, but when the goon tried to get me to head to the ATM with him I escaped for the moment by saying his shoe was untied.
додав Rockford Files 29 Березня 2005

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A sun smilin' mouth-breather.

One who can't look towards the sun without squinting, showing their upper teeth and dropping their mouth open.
Usually wears a Cleveland Browns shirt.
"Hey look at that sun smilin' mouth breather, I sure hope a cloud blocks out that sun before he drools all over himself."
додав F.R. 07 Січня 2005

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1. A moron from a low social caste. Picture someone with a sunken forehead, low hairline, and prominent chin.

2. A guy who goes to the gym seven days a week, probably does steroids, and has a body that looks like a comic-book character. He might be 5'4" but his arms and shoulders are so overbuilt that he looks ridiculous.
If you go to Gold's Gym in the afternoon there are nothing but mouth-breathers.
додав phuckie 16 Червня 2007

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Those mouth breathers will believe anything Rush Limbaugh says.
додав The Polish Parrothead 12 Серпня 2009

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Complete dumbass that finds it difficult to even breathe.
Matt Kulow
додав fartknocker4 11 Серпня 2003

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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.
додав Mover 21 Березня 2004

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