I coined that term this afternoon, while driving down the interstate. Traffic was terrible; mostly because there were some lane closures, which were well marked, had plenty of advance warning messages, but the bozo drivers didn't pay attention and rode all the way to the barrels in the wrong lane.
Meanwhile, drivers allowed these bozos in, so they became part of the parade. Me? I found an exit and went another way. I don't like bozo parades; they have too many dumbasses involved.