Shortened version of CCW. Which is a shortened version of Concealed Carry Weapons (permit to carry concealed weapon)
"oh dude, yo i can't even believe they approved me for a cc dub!"
"awwwwwwwwww shit my cc dub came in the mail!"
"don't fuck with that cat, i know for a fact he's probably carryin. he's got a cc dub"