noun. A literal or metaphorical shit sandwich of truly mega-poopy proportions.
Real citation: "so.. What the hell was going on with the uber turd-burger playing our lil' Will? Even if she skipped by McDonalds one day to save up and buy herself some acting lessons... she'd still be fatter than hell."
(Faith, March 23, 2004, http://www.buffy.com.au/forum/topic.asp?TOPIC_ID=2628&whichpage=8)
Made-up citation: "SAT season has passed, so this year's high school juniors can now safely forget words like 'persnickety,' 'bifurcate,' 'umbelliferous,' and 'uber-turd-burger.'"