It displays that message when I try to log into StarCraft II. What's it mean?

It means it is time to close your computer, sit up, stretch, get out of the house, meet some nice girls, and have a better day than sitting all day at home writing useless posts playing Starcraft 2.

OR

It means that the people behind Battle.net 2 have finally realized their abysmal failure and have all suicided, leaving no one to upregulate the system, so now it is down.

OR

It means that Battle.net 2 have finally become self-aware of its own failure in comparison to its father, battle.net 1, which has been programmed more than a decade ago, and has become a hermit, living under cardboard, eating ants, and resilient to any orders Blizzard gives it.

Pick ur Poison

It means the Terminators invaded.

I like b.net 1 more than 2... I just like the voicechat
now, please help me with this...

It's gone now.

You're right O.o