Top definition
1. Someone who is really dumb
2. A person who doesn't/can't breathe through their nose
by A-Claire February 20, 2017
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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2
General term for a fucking idiot.

Usually seen with a blank stare on their face, mouth slightly agape, and possibly a little bit of drool coming out.
The new temp workers we got are a bunch of mouth breathers.
by Must Love Chest Hair December 19, 2017
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3
1. literally, someone who lacks enough intelligence that they never learned to breathe through their nose.

2. a really dumb person.
In his latest work, the director has forsaken the indie audience and made something for the mouthbreathers.
by hedgerow September 03, 2003
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4
A stupid person who breathes through their mouth, like P Diddy.
P Diddy is a mouth breather
by ===0) December 29, 2004
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5
1. Someone who is incapable of breathing through their nose

2. Someone stupid who is unaware that their mouth is gaping open, often taking in gallons of air and spewing their own dry, bacteria rotten maw into your clean air in your vicinity.
Never let a mouth-breather speak to you very close, or you might regret it.
by Randall Wynn April 06, 2008
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6
The word Eleven in Stranger Things uses to call someone a Bullshitter.
'Mouthbreather'
via giphy
by Strangest Things December 29, 2018
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