This explains what the uber/black badge is and how people obtain it:
https://www.defcon.org/html/links/dc-bb-policy.htmlHere's some blog posts about people who've run the gauntlet:
http://potatohatsecurity.tumblr.com/post/126411303994/defcon...
http://elegin.com/dc21/
https://1o57.wikispaces.com/DC20+Badge+Contest
In hacking circles, this is kind of a big deal to get one of these. It gives you a lifetime free admission to any future DefCon conferences and you're entered into a Black Badge HOF and plenty of bragging rights.
https://www.defcon.org/html/links/dc-black-badge.html