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.
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Rather odd slang for a lesbian, paired with Laser Knee.
"Dude, I totally think that chick's a fire breather."
"Woahz!"
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Any human being that breathes in and out through their mouths, often engaging in idiotic and useless activity. An affinity for sexually crude humour generally accompanies.
Most of the people posting definitions here are mouth-breathers.
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The most nasty ass person of all times, there a slut and a hoe bag they grab your dick and breathe all over u so watch out before rebecca comes to grab your dick
rebecca is such a dick breather.
A person who is just the worst.
"I hate Nancy. She's a total butt breather."
When you are dealing with a lot and can't focus, and need to take a quick break.
I was grinding, but needed a quick mind breather.
Mouth breather was used by Jennifer Love Hewitt in Heartbreakers. She was annoyed with a guy who she considered a stupid idiot. It was later used sever times in Stranger Things.