Nom. adj -- a person who is hopelessly stupid, offensive or socially hindered in the sense that their very presence has become a blight upon the fabric of existence. (Vulgation of the English "jack-ass," reportedly when the coiner of the phrase was too intoxicated to correctly say "jack-ass."
When your wallet or phone is so big when you sit down it pick's up one side of your ass or your whole ass a bit higher and make you lean left or right.
My wallet has so much money when I sit down my assjack makes my right ass cheek higher then the other!