Its way older than 5 years old. Wonderfalls (2004) had a character refered to the mouth breather in derogatory way. I know my brother used that in similar way

Its way older than 5 years old. Wonderfalls (2004) had a character refered to the mouth breather in derogatory way. I know my brother used that in similar way growing up but im sure there are better/older references but those are mine.