It's the thirty third server yet to be released.
Right now, (4/29/16) we believe that the release date is locked up in the Chaos Fighters headquarters in China.
If we manage to get in there, it's probably on the third desk from the left. The bathroom is next to it. If anybody wants to try and steal the release date for server thirty three, you should hide in the bathroom until the coast is clear. Hopefully, nobody will forcefully open the bathroom door.
Note: We are unsure if those are the real locations for the bathroom and release date. They are based off of rumors that I, MyLegGuy721, created which are based off of nothing but complete guesses.