The large, sometimes uncomfortable amount of free space in front of the average Wii owner's TV. It exists so that the Wii owner can have plenty of room to flail their arms around and generally make a fool of themselves.
Similar to the 'demilitarized zone' between north and south korea.
Guy: Why is this couch so far away from the TV?
Other Guy: Oh, this guy has a Wii. I guess it's his WiiMilitarized zone.
Guy: That explains it.