The term used to describe a girl who fails to recognise just how much of a manipulative/controlling/selfish/etc. bastard she's going out with, due to blind infatuation.
Liz: You must be seriously cockwhipped if you can't see what he's doing to you. How can you let him get away with that shit?!
Sarah: What business is it of yours? How can you sit there and judge me, you don't even know what it's like between us. I love him and I know he loves me; I don't need your fucking approval!
Liz: (under her breath) stupid childish romanticist...