Ring-Dang-Doo is a nonsense slang word typically used to describe a women's genitals similar to "Pussy".
The word has no etymology and first appeared in a song by Sam the Sham and the Pharaohs but the word also made an appearance in the 2018 western action-adventure game Red Dead Redemption 2 in a campfire song.
Ring-Dang-Doo now what is that? It's soft and round like a pussycat, Got a hole in the middle and it's split in two; And that's what you call the Ring-Dang-Doo.
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.