Junker , wreck , and heap all refer to a worn-out car, or one that's not running well. A lemon is usually specifically a car that wasn't made well in the first place. An oil burner is a car that's consuming oil at an unusual rate, probably due to a leak. A boat is a big, wide, heavy, older American car, usually dating back to the days when all American cars were big, wide, and heavy. A roller skate , on the other hand is a very small car.
Cruise can also mean to drive around slowly and aimlessly - something like hanging out while moving.
Cruising can also mean to be looking for a date, or the equivalent. As a metaphor, running on empty can mean to continue to work or struggle long after one has lost all energy or drive to continue. When you move your car to the side of the road, you are pulling over . To accomplish a goal or to reach a destination, is to make it . Sometimes, someone who has been very successful in life is said to have made it , or to have it made .