The act of rubbing your back against the edge of a wall to relieve tension and pain. It's a well known fact that violating your home's jagged edges relieves stress, improves posture, and alleviates depression. Studies have also shown that regular backsterbation increases sexual pleasure and rekindles lackluster relationships. Common side effects include missing socks and blindness.
Daniel: Hey, bro. Could you give me a massage?
Noah: Nah, b. I'm in the middle of an intense game of Starcraft 2.
Daniel: Aw, man. I guess I'll just have to resort to backsterbation again.
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.