adj. Used properly, this word describes a major league asshole (or a most-blessed bottom).
Real citation: "Indymedia no more represents "the left" than LGF represents "the right", and I think it somewhat counterproductive to go weighing up the excesses of the loons on both sides to see whose assholes are the assholiest."
(sennoma, April 7, 2004, Electrolite, http://nielsenhayden.com/electrolite/archives/004987.html)
Made-up citation: "At my assholiest, I like to think I am no worse than a bunghole. Well, occasionally a butthole."