n., mythical place where lost computer files, email, text messages, and voicemail end up never to be found again. An electronic version of the Bermuda Triangle, Neverneverland, and Og.
I sent you a text message, but it must of fell into the Oublinet.
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.