Wiktionary
shitbox
n. (context slang vulgar English) A dump; a rundown, messy or disgusting item.
Usage examples of "shitbox".
Even at 7:30, there were a million cars rushing, vying, and honking, a fuming chaos of steel and chrome, including one shitbox eighties-era gold Impala with smoked windows that nearly clipped off his toes.
Parked in front of the store was a little red shitbox Subaru, mudsplattered, also looking rode hard and put away wet.
No doubt the guy was sleeping in the back, like he had the last time his shitbox broke down outside of town.
The Roman driver approached the carters unzipping his jacket, shouting angrily for them to get their damn mules and shitboxes out of the way.