adj. 1. When a thing or action is so fucking stupid that it needs a higher form of adjective for its idiocy.
2. extreme version of idiotic
"That guy is so dumbassical I could punch him."
"What a dumbassical move."
A type of person who is really fucking annoying, and, should they be found trapped in a hole, they should be left there.
"Boy, that jackass is a real French horn player."