A chatty bitch is defined by the seeming neccessity for them to chat on IM programs such as MSN, Yahoo, or Aim. You can usually spot a chatty bitch because their keyboards are in bad condition from chatting so much, speficially the enter key and space bar.
Person 1: Lets go do something
Person 2: No thanks, i'm to busy chatting to somebody hundreds of miles away who I think I love but have never seen the person.
Person 1: You're retarded.