adj. Quite fast.
Real citation: "In the movie I, Robot, Will Smith drives his ultra-zoomy sports car up to a parking ramp."
(Gregg Easterbrook, "Load your muskets for the Democracy Bowl, and why "safe" strategy isn't safe," Jan. 25, 2005, http://www.superbowl.com/news/story/8132369)
Made-up citation: "Speedy Gonzalez is the ultra-zoomiest cartoon character of them all, but he just doesn't have the sex drive of Pepe Le Pew."