The Chat Room is a place for people to get together and talk Giantess. I don't know if people still chat about this stuff but I get a bit nostalgic when I think about all the great people I met on IRC.
So a little bit about how it work, if you're familiar with IRC you'll find this old hat:
Talking is easy. Just enter the message you want in the large text field and hit the Send button.
To perform an online action type "/me" (without the quotes) followed by the action you want to take. So for example if I typed "/me jumps up and down" everyone else in the room would see "cmb jumps up and down".
There are more functions but I'm sure you can figure them out.
Finally, to leave the room, just go to another part of the site or if you're done surfing simply log out.