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Mouth Breather 

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?

Mouth Breather 

Any person who is so stupid that they don't have the ability to breathe out of their nose.

A person who cannot cut over a 35 on their ASVAB.

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.
Mouth Breather by Randomus August 25, 2006

Mouth 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.
Mouth breather by TInaJack February 26, 2018

mouth breather 

A sun smilin' mouth-breather.

One who can't look towards the sun without squinting, showing their upper teeth and dropping their mouth open.
Usually wears a Cleveland Browns shirt.
"Hey look at that sun smilin' mouth breather, I sure hope a cloud blocks out that sun before he drools all over himself."
mouth breather by F.R. January 7, 2005

Mouth Breather 

Someone who's been in too many fistfights and thus has had the ability to breathe through the nose beaten out of him. The usual implication is that the ability to use the brain has also been beaten out of him.
My bookie sent a mouth breather to collect for him, but when the goon tried to get me to head to the ATM with him I escaped for the moment by saying his shoe was untied.

mouth breather 

Those mouth breathers will believe anything Rush Limbaugh says.