Fag is a derogatory term for a gay person. Or a term used for insults in general. And rats are commonly associated with dirty places. So when calling someone a "Fag rat" you are calling them a dirty/ gross "fag". Also used as an insult in general nkt specifically a dirty person
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.