An overdone custom car/van that can barely drive properly due to its customizations.
A car or van that appears to have a driver incapable obey the rules of the road.
A vehicle that is driven with no regard for public or passenger safety.
Man, when that assmobile was passing I could barely hear myself think.
Hey did you see the assmobile wrapped around that tree?
Wey, that assmobile nearly hit that person on the pavement!