This question have been wandering around my mind for almost 1 year. I saw many of my ex Taiwan colleagues like to use this "Orz" in their daily conversation in instant messenger. And I even saw some T-shirt printed "Orz". What is Orz actually? Is it a new word, symbol or acronym?
I tried to ask my friends and the way they answer me is like this.
Me: "What is Orz actually?"
Friend: "Orz is Orz la."
Me: "What do you mean by Orz is Orz."
Friend: "Orz is nothing but Orz la, cannot explain dude."
Me: ...... <give up asking>
And one day, I saw a picture from my msn friend avatar. And i shouted, "OH.... I SEE", I finally got it, I finally know what it's means.
For those who have no idea what is Orz means, don't worry, I will clear all your doubts here.
The following is the image that help me to understand what Orz mean. I guarantee you will get some idea once you see it.

Still don't get it? No worries, the following attached with more images that related to Orz and a few lines of explanation on Orz are provided. For detail explanation, you may go to http://en.wikipedia.org/wiki/Orz
Explanation: a Japanese emoticon representing a kneeling or bowing person, with the "o" being the head, the "r" being the arms and part of the body, and the "z" being part of the body and the legs.
By now you should know what is Orz , if not I really will Orz.
Source: http://en.wikipedia.org/wiki/Orz