noun. Idiocy on a breathtaking level, even by current standards.
Real citation: "Wrong. I only wanted to fight you when I realized you were a complete idiot and your ideas sucked, much like how you are leading the blue team quickly toward megatardery."
(Dreadnaught, June 15, 2006, http://www.brawl-hall.com/forums/showthread.php?t=96897&page=2)
Made-up citation: "Church and state must be kept separate, because each has its own metric truckload of megatardery that should not be allowed to breed."