noun. A serious case of dumbass, butthole-type behavior.
Related terms: buttmuncher, buttmunching, buttmunchy, buttmunchery.
Real citation: "So Mad Props to Reggie Sanders and all the others who went out of their way to make this kid feel special in spite of an act of royal buttmunchitude."
(Gogo, "Mad poops," June 16, 2004, http://www.iwatchtoomuch.tv/archives/2004_06.html#000187)
Made-up citation: "I think it was Frank Zappa who said, 'There is more buttmunchitude in the universe than oxygen.'"