There are MMOs for consoles, the first major one was Phantasy Star Online for Dreamcast and a new one is being released in English in February for PSVita and PC. There are also games like DC Universe available on PS3 and there are some other games that have been released and the term Massively Multiplayer Online can also mean COD as it has a massive online community or it could mean like MAG (a 256 player FPS on PS3)