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1 definition by am_rockstar

 
1.
Someone incapable of breathing out their nose because their mouth is always yapping. They can often be seen in forums where they're assumed to be clever. However, assumptions usually land you in jail.
Kia salespeople=everybody at Kia, involved with Kia or even knows about Kia is a mouth-breather.
by am_rockstar December 22, 2005