Fill me in
Being informed about more details of something. Giving all the details. To brief or inform.
Karen: Becky, met this really hot guy at the bar last night.
Becky: Nice!! Fill me in.
Karen: He took me back to his place and showed me how big....
Becky: And???
Karen: .... his wallet was. I told him I didn't care how much money he makes, I just wanted to fuck his brains out.
Becky: Karen you slut! You're too easy hahaha.