When It's Done

Originally used by 3D Realms as the "release date" for the game Duke Nukem Forever, it basically just translates to either "we don't know yet" or can be jokingly used in the context of indefinitely delayed/Early Access games.

Random Dude 1: "So when's Star Citizen going to come out of Early Access?"
Random Dude 2: "When It's Done!"