not mucus related. in the onion/garlic family.
schna is in aisle 3 next to canned nostrils
As a noun it means a person that acts stupid. When used as an adjective, it means retarded. It can also be used as an interjection meaning, "yay!"
(Noun) Nick: Why is that kid touching his butt?
George: I don't know, but he is a total schna.
(Adjective) Billy: That's a schna thing to do with a puppy.
(Interjection) Julian: Schna, schna, schna! I love puppies!