a descriptive word, that can be used to describe anything, or anybody. This word can be used as a compliment, an insult. It is a neutral word. Jawnbus can be used as any part of the English language, it can be a noun, verb, direct object, but is most commonly used as an adjective.
"Did you see that jawn
"The Jawnbus looking one"
"Aww yeah boo, he was a real Jawnski