LOL - nothing like 'rubbing it in', eh ?
Had already acknowledged what has become the common derogatory .... still say mine makes a hell of a lot more sense.
Regional variations aren't always reflected in google searches, nor in what becomes common on the net.
What I grew up with was the term 'mouth breeders' - and we all understood what it meant.
Slack jawed idgits as 'mouth breathers' - yeah, guess I can see it - but the term is kinda silly. Everybody has to breathe through their mouths at times.
I'll stick with 'mouth breeders' - and just smile when people say 'Hunh ????' !!! *w*