A person who dosent understand; stupid; dumb; etc
"That person is a mouth breather."
"Ugh, you're such a mouth breather."
by DEMOGORGAN October 01, 2018
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A person who without hesitation wil tell on you or someone who gossips too much and wont keep their mouth shut
You know the feds will be at your door if bob knows what you're doing, he's a mouth breather.
by Squig9669 February 06, 2018
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A person who's so unbelievably dumb, they couldn't even be bothered to breathe through their nose. To put it simply, mouth breather is another word for an idiot.
"That guy, *name here* is nothing but an inconsiderate, close-minded mouth breather!"
by Suburbanz71 February 17, 2021
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One who doesn't know how to breathe through their damn nose, causing them to constantly pant like dogs.
"Dude, Steve is such a fucking mouth breather"
by Asm0deus July 06, 2017
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A person who will wear their face mask over their mouth, but not their nose.
Stay away from that mouthbreather, you might get COVID-19!
by Buxrmf January 22, 2021
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