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.
by Rockford Files March 30, 2005
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A reference to the breath of a lesbian, or a reference to a lesbian in general.
From the smell of her breath it was quite odvious that Bard was clearly a beaver breather.
by Edwa Tramqua April 13, 2010
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A heavy breather is a generic name for a person that is in a position of power and influence. They do not breathe any louder than the rest of us, but their breath/words have a larger impact on society. This term usually is used reserved corporate executives or high level politicians.
"So dog, whaddid ya do today?! Dude, I had to sit in this meeting with a bunch of heavy breathers"

"The heavy breathers of the right are panting for spending cuts again"
by Ninja787 September 23, 2009
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someone thats breath smells like they just a a pound of baby shit.
i woke up in the morning next to my boyfriend and i was like " damn boo you must be a shit breather!"
by Chloe is orgasmic January 14, 2011
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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?
by CitadelBulldog96 December 11, 2009
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