Welcome to the ever-interesting world of Japanese idiomatic expressions. I don't care how good your Japanese is, I'm betting this is something only living in Japan can teach you-until now. I doubt they covered it in Japan-go 101, but hey, I could be wrong. Here goes:
Allow me to set the scene. An innocent, enthusiastuc ALT, (AKA, Me) doing her best to be genki (energetic and entertaining) despite the fact that the temperature inside the school is zero and the teachers have decided that, since so many students have been catching colds, they should start keeping the doors and windows open (What the $#$%@%@Q@#%# ?!) As she jumps, dances, and karate-chops her way around the room, pretending to play "Simon Says" in a crude attempt to survive the bitter cold...
Student: Society's window.
Teacher: Huh? (clueless).
Student: Social Window! (Trying to be discreet).
Teacher: WHAT the heck is that? Social window? What does that mean? (loud and obnoxious. If everyone wasn't listening before, they are now).
Student: It's open.
Sensei: . . . Oh...
So, what does it mean?