This is the term for someone who, during an argument, he know he is wrong smoothly changes his postion to your position in an attempt to appear he was right all along.
Joe and Jeff were debating the cause of the web-page failure at work. Jeff knew that it was the IIS settings but Joe was sure it was in the html code. Once Joe realized Jeff was right he said, "oh yeah, the ASP settings in IIS, that what I said". Jeff then questioned his argument and realized Joe was right. Jeff had been oched!