adj. Really quite devastating. Kablooey!
Real citation: "Owing to light speed, not even advanced aliens would see the mega-destructo wave front coming. In other words, a careless Brookhaven postdoc chopsticking Chinese takeout might inadvertently destroy the cosmos."
(Gregg Easterbrook, "We're All Gonna Die!" Wired, http://www.wired.com/wired/archive/11.07/doomsday_pr.html)
Made-up citation: "If I had boulder-hurling, mega-destructo, super-Jedi telekinetic powers, that would rock."