Yuppie Short Bus

Best definition
Yuppie Short Bus
A bright-yellow Hummer 2 SUV.
Derived from the schoolyard slang term short bus–the bus mentally retarded and disabled students ride in–and the fact that, like American school buses, it is bright-yellow and black. Unfortunately, in the case of the Yuppie Short Bus, the retarded person is usually in the driver’s seat.
While crossing the street, I almost got creamed by an asshole driving a Yuppie Short Bus and yakking on a cell phone.