early sharer
A person who communicates intimate details about their personal life when you've only just met them in an innappropriate, mental alarm-bell ringing way. They may well lack true friends to do this with and so try to make you their new BF.
"I just cannot bear that girl, man, she's such an early sharer. Five minutes after I met her she was talking about her and her boyfriend's sexual problems and he was RIGHT THERE!"