Someone who is generally pretty cool with a quirky side. This person, usually female, is fun loving, romantic, somewhat crazy and likable. Unfortunately though, a "Biddz" is usually branded as being promiscuous and most guys just try to sleep with her rather than actually get to know her.
Bob - "So I hear Biddz is coming to the party tonight..."
Joe - "yeah, I know. It should be a good time because she's always really fun, I think I'll try to get with her"
Bob - "Go for it man!"