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.
Somebody who's lower lip is so big that it can be caught on a trip wire due to the over breathing through the only orifice they know how to breathe out of.
Mike isn't quite a Glass Licker, however we'll give him the status of Mouth Breather because he got a 25 on his ASVAB.
Josh is a Mouth Breather. His girlfriend, who's been sleeping around with half of the state, has him fooled into believing they will get married.
Josh says he gets 5,000 dollars a month hauling milk... what a mouth breather.
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.
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.
The green and yellow mucus boogers that are stuck in your throat when you try and clear it or cough and it comes up your throat when you spit it out.
You are feeling a little nasally and you need to cough to clear your throat and you have mucus come up, you cough, and something thick comes up your throat. its mouth boogers