I don't really have a battle-cry. I have more of a cry-like-a-little-girl when its over.
Counter-Strike: "Don't follow me, I'm going to be dead very, very soon. No, really."
Every game where I die: "Ohhhhh, you did not just do that to me...."
On the very rare occasion that I did something that worked: "Monsters do that."
If I'm playing TF2 and die: "Spy!"
EDiT: The very next thing I did was go and watch ZP #1.
I'm still laughing so hard that my face hurts.
So, I have got to do this. My new battle cry is (deep voice): "For Twing-Twang!"