Any dystopian landscape or system in which there is little greenery, fuel or humanity to be found. Named after the Mad Max series of films, anything madmaxian is essentially a brutal, lawless hellscape likely filled with either bandits, raiders, and people eagerly executing their worst instincts, or bleak emptiness.
Colombia, Somalia, New Mexico, and regular Mexico are thought to be Madmaxian - a good place to be sunburnt, robbed, and possibly shot.
A: Dude, let's go to Tijuana for some drinks, drugs and bitches!
B: Nah man, that place is Madmaxian. I don't wanna die in three ways at once. Let's hit up Vegas instead.
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.