A complete retard, lacking in ALL basic skills such as speaking, writing, reading. Or a person who isn't mentally retarded, but gives off an impression of total retardation.
Holy crap, my teacher is a complete wonkyu.
Yo that dude ran across the street, what a wonkyu!
It's the state of being very high on ketmine but before the K hole. It is generally asumed the this state (the wonkywalrus state) is an enjoyable state to be in