Any small car that appears to be able to fly. Derived from Wonder-Bug
Look at that yellow WonderBu next to the Camry.
WonderBu: define #2
adj. wonderful, fantastic, better than expected
I had a WonderBu time with your wife last night.
WonderBu: define #3
Anyone who acts/feels like Johhny WonderButt for a time.
Damn, I was WonderBu last night!