A fusion of two words: Sarcastic and Bastard. Many bastards are sarcastic and vice versa. Hence this great word which I made up and should have patented, though it will most likely never catch on with the masses.
A prevalent tendency to approach everything in life with a sarcastic bent/response.
Sometimes called a mental disorder, but mostly only by those who don't quite grasp sarcasm.
Maddy was facing possible suspension for failing to control her Deanopathic Sarcastia while addressing her teacher. The principal suggested she may avoid the suspension by bringing in a note from her therapist, excusing her for her medical/mental condition.