In South African English, the word "skadonk" is colloquially used to describe an old car that is usable, but nearing the end of its lifespan. It is onomatopoeic with the sound that such a car would make (a noisy drive).
I grew up thinking this word was standard English, however recent conversations with American friends indicate that they have never heard it before.
I have done a bit more research and googling online and have really struggled to find an official definition of the South African usage of this word anywhere. In fact, it's very difficult to find it referred to in this way online at all, even though it is used all the time here. Is it defined somewhere, and where does it come from?