The very person you can count in on when you are out with some dude or gal and they cover for you by saying you were out with them. Or that box of condoms in the glove compartment belongs to them and the left it there for some dumb ass reason.
The kind of ride you have to smooth talk. "C'mon baby just get me to work and I promise I will get that new carburetor you need." If your friends have 10 different shady nicknames for your g-ride, then you're rolling in a bucket.