You just sit there quite contently and bitch with a few people about who you're hating the most at the moment.
I actually don't mind bitch sessions, as long as they don't involve the person being bitched about finding out about all the bitching. Then it gets awkward.
But when its just a good old fashioned bitch session, it's oh so fun.
I love it, and you may say that I'm a bitch, that's ok, because we all do it, so therefore, no matter how much you deny it, you're a bitch too.