Mundschnaufer
Usually a person with a reciding chin and a lack of a jaw line that mainly breathes through their mouth instead of using their nostrils like a sane person. An other defining feature of a Mundschnaufer is low intelligence and mediocre physical performance. You're better of not associating with these kinds of people as they are very socially akward and highly mentally unstable!
A: "Kevin and Peter both are useless idiots and disgusting Mundschnaufer."
B: "Fucking gross!"
B: "Fucking gross!"