A person of low intellect who is incapable of critical thinking. A mouthbreather watches Fox News religiously and believes everything they hear there as well as anything on the Internet that validates their ignorance.
Donald Trump appeals to every mouthbreather in the country because he is as ignorant and unimaginative as they are.
от SheckyGrl 17 януари 2016
1) Person incapable of their own thought, who when faced with a decision, or when asked about personal opinion on something opens up her or his mouth in shock and astonishment that there is such thing as personal opinion. With mouthbreathers it happens constantly due to damage caused by upbringing by helicopter parents, or other emotionally damaging authoritarian or social influences. Can be spotted at every step of social and economic status ladders.

2) A reason why normal people invented law of the land ( equivalent of pinning a note that states "anyone who will touch my coffee cup will get their car keyed" ) and lawyers to herd those idiots away from harming normal families.

3) Equivalent to an alarmist or a zombie - AVOID AT ALL COST - prolonged exposure might lead to compromise of inner emotional barriers and contamination of own soul with emotional AIDS. If you really want to help such person you can only put some objects in their way in hope it will trigger aha moment in them, so they will start slowly doing stuff for themselves - pretty much the same deal as when handling alcoholics. When engaging personally with help there is high chance of them making their mess your business, continuing their crazy of not doing anything for themselves.

4) Private Pyle from Full Metal Jacket after emotional fuckery by Gunnery Sgt Hartman
me (at university): So mr advisor, is what I wrote in thesis valid and does it have your okay stamp?
advisor: No, you gotta change thingie A to B
me: umm... but why? the whole world is doing A. B is kinda retarded way (provided metric shit ton of references)
advisor: No, you gotta change A to B
me: (oh fuck... im dealing with a mouthbreather here...) okaaaay, so can i post that on my blog so the whole world will know you are in favor of B?
advisor: (says nothing)
me: so, can I now assume that A stays and all is kosher?
advisor: *okay*
me: THANK YOU! (sigh... finally)

(true story)
от Spaceship Earth Astronaut 16 ноември 2012
A subspecies of Homo-sapiens known for their lack of any intelligence whatsoever. Their young are raised entirely on a diet of Ribena and Chicken Nuggets, whilst the adults have no interests other than Stella Artois and ITV2.
Dude, did that mouth breather just trip over his own foot?
от sugarcoatedGandhiman 10 февруари 2011
A person of inferior intellect that lacks the faculties to recognize he is breathing heavily through his drooping open mouth; one who watches Fox News and Nascar with religious zeal.
Donnie shops at Evil-Mart like all the other mouth breathers.
от Joe Flood 04 септември 2007
The only thing these crude, rude, and obnoxious people have in common with the human species is that they have a hole in their head with which they breath; otherwise, they are pretty much amoebas with vocal chords.
check your local pool hall in any small southern town
от lee ann hansen 06 януари 2004
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.
от Mhuur 25 ноември 2002
A mechanical engineer who is much inferior to their counterpart the electrical engineer. Often found staring at a machine with mouth agape breathing through their mouth in a stupid manner and blank expression on their face wondering why the machine will not work. Luckily an electrical engineer is never far away to save the day for the mouth breather.
Hey Joe check out the mouth breather staring at the labeler like an idiot. Do you think I should go help him out?
от CitadelBulldog96 11 декември 2009

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