Fred Flinstone car
n.— «Then there was what Woolley often euphemistically calls the “Fred Flinstone cars,” vehicles in such a bad state, you can literally see the ground through the floorboards.» —“Holiday Safety Blitz Ends With The Usual Bad Drivers Hitting The Highways” CityNews (Toronto, Ontario, Canada) Oct. 9, 2006. (source: Double-Tongued Dictionary)