1. A person, of ambiguous sex, who enjoys Science Fiction and Computers.
2. A person, generally a girl, who ends up in a common-law marriage with their college room mate.
3. Any person with a black soul and a love of hacking.
1. God, it's playing Dungeons and Dragons again. It's such a Cass.
2. Only a Cass would live with their college room mate for seven years.
3. OMG, John just changed my Myspace Profile. He's such a Cass!