Top Definition
Any small car that appears to be able to fly. Derived from Wonder-Bug
Look at that yellow WonderBu next to the Camry.
by Chaka October 27, 2003
adj. wonderful, fantastic, better than expected
I had a WonderBu time with your wife last night.
by Iconoclast October 27, 2003
Anyone who acts/feels like Johhny WonderButt for a time.
Damn, I was WonderBu last night!
by Bu October 25, 2003
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