The kind of dog you get when someone tells you that they have a really cute Lab/Boxer Mix that really needs a good home and it turns out to be part pit bull and part Alien.
"Did you hear about Jack?"
"No."
"He's still in the hospital after being mauled by his new Liebrador Retriever his uber-whore ex- girlfriend gave him for his birthday!"
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.