Mouth-breather 

1. Someone who can’t breathe through their nose.
2 A stupid or ignorant person
3. Someone who refuses to wear a mask for political reasons.

4. All of the above (most common)

That Trump-lovin’ gun-totin’ fool is one heckuva mouth-breather.

Mouth-breather by The Smose August 9, 2020

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

Darth Breather 

Señor Owen
Of Spanish class

Person 1: What is that, gale force winds out there?

Person 2: Nah dude, Señor Owen is behind you.

Person 1: Goddamn he sounds like Darth Vader.

Person 2: Now do you see why we call him Darth Breather.

Darth Breather by Nanna13 November 18, 2009

mouth-breather 

Complete dumbass that finds it difficult to even breathe.

Matt Kulow

mouth-breather by fartknocker4 August 11, 2003

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 by Rockford Files May 13, 2005

mouth breather 

A Conservative.

Those mouth breathers will believe anything Rush Limbaugh says.

mouth breather by The Polish Parrothead August 12, 2009

No Breather 

When you are having sexual intercorse with someone and their arse smells like ass and you are having trouble busting your nut and you stop breathing so you can enjoy the sex and stop smelling the nasty stench. Then you almost black out holding your breathe so you can bust the best nut you’ve ever busted.

“Yo I was fucking Becky last week and her butt was a little musty, so when I was hitting it from the back I had to pull a No breather to finish fucking her. It was honestly the best nut I ever busted”

No Breather by Shayzee#7 February 22, 2019