Apparently they went backpacking around Europe together or somet...
Cristina: Apparently they went backpacking around Europe together or something. Before med school. You know that woman all but kicked me out of the bed?
Cristina: And "deth" ... Meredith's name's not "deth." It's Mer!
Derek: I really feel for you.
Cristina: I mean she's never even mentioned this woman. How good a friend could she be?
Derek: Good enough to kick us both out of bed.