Go or Ohhh....?

Last night at class my instructor told us she wasn't feeling well and that class probably wouldn't go the whole time. She also commented/joked that if she left the room quickly that meant class was over! So about halfway through class she asked us to turn to page 137 and look at some Communication matrix. She said something else which no one really understood, there was a slight pause then she said "Go" or "Ohhh" and then left the class room.

So the class sat around slightly confused as to if we were suppose to work on something specific on the Communication Matrix - or was that our signal that class was now over....! We sat there for a few minutes, a couple people took it as their cue to leave, then she came back in the room and announced class was over.

I guess she said "ohhh" as in "oh I'm not feeling well"!