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1.
A mysterious and loyal sentient with herculean strength and agile capabilities to defend or do battle when called upon.
Although surrounded by a gang of thugs, the frail little boy smiled, fully knowing that a simple whim can conjure upthe ubernaut.
by Teocarlo Pulgar September 03, 2003
 
2.
Whoa. Those people in that group over there look like they've been on a space shuttle or rocket before! They must be Ubernauts.
by Jaline April 07, 2003