Clunker (noun)

1. An old and run-down car, often in poor condition and in need of repairs.
2. Something that is old, in poor condition and likely to break down or stop working.

Origin:

Possibly from the sound made by an old, poorly running car, or from the word "clunk" meaning "to make a dull thudding sound.

Examples:

1. He drove a clunker that was held together with duct tape.
2. The clunker finally broke down on the way to work.
3. The clunker was so old that it didn't even have seat belts.
4. He sold the clunker for scrap metal.
5. That old computer is a clunker, it's time to buy a new one.