mike check?
They use that term in all their assemblies (termed GA's for General Assembly) to get the group 'leaders' attention, the GA's are where they make decisions for the hive -er- group.
I've been observing their www.hongpong.com web feeds for a few days now ... this is typical of a GA event ...
Also, a lot of coordinating takes place via IRC here: chat.indymedia.org
using:
#occupywallstreet
for the channel name.
The MO has not changed for 3 or 4 days now ...