Carpartment

When you live in your/a car

or

When you sleep in your car with your boyfriend/girlfriend because you cannot bring them in your house, and your too broke or do not want to afford a room

"The sex sucked, so I made him sleep in the carpartment"

or

"Damn, sorry you got kicked out. You can't stay here but my blazer's in the back, put the seats down and you can sleep in the carpartment"