Any kind of deteriorated vehicle, usually the kind that mom and dad make you drive in high school. Popular shitwagons include the Chevette, Pinto, Yugo, Festiva, etc.
by Serpent December 03, 2003
A car in piss poor condition that not even a hobo would sleep in. Usually smells like the county landfill from it's previous owners' offspring spilling soda and crapping their pants in the backseats. Called a shitwagon because of it's similarity to what a farmer hauls fertilizer in.
by DennisIsEvil October 07, 2006