Someone incapable of breathing out their nose because their mouth is always yapping. They can often be seen in forums where they're assumed to be clever. However, assumptions usually land you in jail.
Kia salespeople=everybody at Kia, involved with Kia or even knows about Kia is a mouth-breather.
ayon kay am_rockstar ika-22 ng Disyembre, 2005

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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
ayon kay Frostivers ika-04 ng Pebrero, 2009

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anyone who you see with their mouth wide open, like a booger has clogged their nasal orifice. They just look like they're dumb, doing everything with their mouth open, with no care in the world.
"That mouthbreather had his mouth open so long that his tongue chapped."
ayon kay jeremy ika-27 ng Agosto, 2003

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a fat person who cant breath through their nose because walking is too much excercise for them
terrence you're such a mouthbreather!
ayon kay bobbypoo ika-24 ng Mayo, 2005

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a person who lays in bed next to you asking 1,000,000s of questions and even when they are not talking you still get to breathe in their out cause they are breathing through their mouths
blah blah blah blah blah. *uuuuuu huuuuuuuu uuuuuuu huuuuuuu uuuuuuuuu huuuuuuuuu uuuuuuuuuu huuuuuuuuuu*blah blah blah blah blah. *uuuuuu huuuuuuuu uuuuuuu huuuuuuu uuuuuuuuu huuuuuuuuu uuuuuuuuuu huuuuuuuuuu*blah blah blah blah blah. *uuuuuu huuuuuuuu uuuuuuu huuuuuuu uuuuuuuuu huuuuuuuuu uuuuuuuuuu huuuuuuuuuu* Mouthbreathers suck.
ayon kay Noteric Thedead ika-22 ng Marso, 2008

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A person who breathes loudly through their mouth with a nasally voice. Generally seen playing Dungeons and Dragons in the school library and looking at pictures of naked anime women in the computer labs.
Studies indicate that mouth breathers also have loud obnoxious laughter.
The ugly guy with the long red hair who is taking an arts degree but likes to pretend he's in Computer Science.
ayon kay Ace ika-13 ng Oktubre, 2004

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Derogatory. Special species of fanboy dork who breathes through his mouth. When not collecting funny books, watching cartoons, playing dungeons and dragons, or video games, he is stalking goth girls or getting beat up.
The pimply faced mouthbreather with coke bottle glasses crept into the comic bookstore. He watched the goth girl for 5 minutes before he walked up and said to her, "Gee, (weez, weez, weez) you remind me of Electra from the X-Men funny books...(weez, weez, pant)
ayon kay Jerry Bathers ika-21 ng Enero, 2006

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