adj. Fantastically asshatty.
Related terms: asshat, asshattery, asshattitude, asshatish, asshatesque, asshatfest, asshatful, asshatless, asshatted, asshattedness, uber-asshat, mega-asshat, super-asshat, non-asshat, Admiral Asshat.
Real citation: "....wait, Angelina Jolie has a long resume of starring in asshatastic films, too. but her voice does not sound like five testicles, either. "
(El Grego, http://www.rottentomatoes.com/vine/archive/index.php/t-317593)
Made-up citation: "The most asshatastic thing I've done lately was wear two different shoes to work. Or was that just doofus-like?"