Satan's waterfall is another word for having your period. This is referred to satans waterfall because satan means evil and hell (basically what a period is) (oh and because satan normally associates with the colour red like a period) and waterfall means the constant flow of blood.
"we all have satan's waterfall today" says Emily to her friends
"ik our periods hurt like hell" says emily's friend
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.