512er 

Someone that lives in Austin and thinks they are far superior than all the other people in Texas.

Frank: That is soooooo weird

512er: Yeah no shit, this is Austin

Frank: That explains it...

512er by Patty d with olympian sperm December 13, 2012

area 51ers 

people who will see a conspiracy in everything; skully

Those tools down at the Bunny Hutch are all area 51ers

area 51ers by lotuspanda March 15, 2008