JupiterMGO usually refers to young adult males that pose as female gamers in any online type of game. This is only usually done to get people to look at certain things like youtube pages and things of that sort.
After being revealed as a male, this male usually only plays the game with people who are very good at it, and will most likely never play with his long time friends ever again.
"Dude I just found out about this girl on Metal Gear Online. Her name is Erika and she's so hot, check out her youtube page it's.
(Two weeks later) Dude I just found out 'Erika' is a guy! What a JupiterMGO!...Oh well at least the pictures from his youtube page is of a hot girl."
A drinking game played while watching the Starz TV Series, "Spartacus: Blood and Sand". Each time the word "cock" is spoken, everybody must drink a shot.
As a kicker, when the words, "Jupiter's Cock", is spoken, everybody must do a double shot.
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."