n. the condition of being an ass named Jonathan; to achive this condition, the Jonathan must be unquestionably retarded, inconsiderate, or offensive. This doesn't necessarily make the Jonathan a bad person, but it probably is one.
Jonathass: "Did I ever tell you that I used to have a big brother, but he died?"
Naive conversationist: "Oh my gosh! I'm so sorry! That explains why you act like an ass!"
Jonathass: "Hahahaha. I'm glad you believed that piece of BS."