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3.
As a perjorative adjective, implies that someone behaves worse than another who is not card-carrying; i.e. a card-carrying --- is worse than a normal ---, and is possibly drawn to others of his kind.
He's a card-carrying douchebag.
by Marhenhuh March 21, 2010
 
1.
genuine and long standing, authentic
I'm a card-carrying High-School graduate.
by Light Joker June 07, 2007
 
2.
A description of stating an interest in or membership of a given topic, issue or organization, regardless of whether the organization actually exists. Originating from the days when business and membership cards were a greater definition of who you were; i.e., membership card of the NRA or democratic/republican party.
"I'm a card carrying trekkie nerd geek and proud of it"!

"Cletus is a card carrying member of the National Racist -er, I mean National Rifle Association".
by Grafikman February 26, 2012