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!
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!
by OurSavior_Jonathan December 6, 2010
 Get the schnamug.
Get the schnamug. by #27907 December 12, 2007
 Get the schnamug.
Get the schnamug. A word you use when you don't know what the word is for something but you know the person you're talking to knows what you mean
Can also mean penis
Can also mean penis
by jigganigga2 March 26, 2019
 Get the schnasmug.
Get the schnasmug. by Esketit bitch June 14, 2019
 Get the Schnamug.
Get the Schnamug.