I saw this in somebody's signature on Nipmo Airsoft's site, so I decided to search it up myself. It's actually really cool.

We're not talking about Call of Duty perks here, they are more of titles. Whenever you meet a certain requirement, you put a title in your signature to recognize that, and hopefully build up your own record of airsoft history. Of course, it's honor based, as airsoft itself is. The original poster says that the perks were made to be mostly humorous, so that people didn't compete to get them and end up cheating. Here's the link to the full description:
http://www.airsoftretreat.com/forums/index.php?topic=81320.0

Sure, it's kinda pointless, but it's a neat idea that can tell other airsofters about yourself in a non creepy way. I should have my perks added into my signature in a couple minutes.