This is the action of liking something on facebook and then immediately unliking it so that the person gets a notification that you liked their post, but when they check, they realize that you haven't
I saw that you psych liked my post. War has now been declared.
A "like psyche" is when you "like" something on Facebook, giving it a thumbs up, and then immediately "unlike" it. The person will receive a notification that you "like" their post, only to find the thumbs up is gone. This prank is most effective if accompanied by a comment about the sweet "like psyche" you just pulled.
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.