|Smart people breathe only|
through their nostrils.
For whatever reason, “Mouthbreather” has become a synonym for “stupid person”. The thing that doesn’t make sense about this phrase is that everyone breathes through their mouth. If you spend your whole life breathing through your nose then you’re the one with the problem here.
“Mouthbreathing” may have a bad connotation because of bad breath and oral hygiene, but if that’s the case then why is it synonymous with stupidity? Smart people can have halitosis too. Maybe dummies have worse breath than geniuses, maybe not. I doubt there has been much scientific research on this issue.
Bad breath is gross and having someone exhale it into your face is disgusting, but is “nosebreathing” that much better? It might seem like a more dignified way to breathe until you shoot a booger on someone’s cheek or accidentally blow a loose nose hair into their mouth during a conversation. Is that really more sophisticated than blowing your ass breath into someone’s face? I don’t think so.
A “mouthbreeder” might be a better derogatory term to use. A “mouthbreeder” is someone who gives lots of blow jobs. Even that though, not sure that’s a bad thing. I think the lesson to be learned here is that mouths are fundamental parts of everyday life for human beings and so nothing that we do with them should be deemed foolish. They’re intrinsic to our survival. Mouths are good.