(n.)A user name, whose origin is from AOL Instant Messenger. Car dice13 would add buddies, and spam them until he would get reported, or blocked. Car dice13 then went to various web forums, and online MMORPGs and created accounts to insult people, or spam. People now create accounts called car dice13, car dice#, or call themselves a car dice13 account. They use these accounts to spam, flood, or insult people from various places on the internet.
Car Dice13 just spammed my inbox.
He just created a Car Dice13 account.
Car Dice13 just dissed you.