29
An extremely stupid person, often referring to a person with Down syndrome (a retarded person)
1. That kid Ross has Down syndrome, he is a total mouth breather
2. Do you breath of of that mouth bud?!?!
by Donstar3 May 31, 2017
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30
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.
by Noteric Thedead March 22, 2008
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31
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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