An act, occurence, object or state-of-being that transcends pure epicness.
Jumping out of a plane without a parachute is epic, doing it while on fire and plunging towards a pool filled with laser-beam-wearing sharks is uberepic.
Something that is BEYOND epic. An event, action, story, or phrase too great to merely be called epic. It is uberEpic!
That UFC fight last night was uberEpic man!