1. Any Vehicle of any make or model known for inherent problems.
2. A car/truck/van/etc that is broken more often than it is running.
3. Any goofy, oddball, badly engineered, or poorly implimented component that causes a vehicle to reflect definition 2.
4. That tiny 99 cent part that breaks at the most inconvenient time and then magically ballons into a $1,400 shop bill.
Dammit! My Thunderbird is a real Mechanic's friend! That's the fifth starter it's chewed up since I bought it!