It is the elevated form of duper. Kinda like charmander to charzard. Its that kind of leap which establishes Jupiterdupiter above just duper itself. At duper you may feel as high as the moon, if that, but when at Jupiterdupiter levels, ur actually one of Jupiter's 63 known moons.
Stoner 1: "Yo, wanna blaze."
Stoner 2: "Nah, I've got class, I'm not trying to get Jupiterdupiter."
Stoner 1: "Come on man."
...10 minutes later
Stoner 2: "Yo, I'm sooo Jupiterdupiter."
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.