The book is 'hers'. [=the book belongs to her; it is her book]
a former professor 'of hers' [=one of her former professors]
That face 'of hers' [=her face] is hard to forget.
(..) I know what looks sexy on guys. Just wear what I suggest, and she is gonna go nuts for you. So you're saying... ...if I wear these pants, I might be getting into hers? Why do men keep talking to me like this? So the fact that I'm a doctor and my wife's a reverend... ...that's important to you? (..)2004 TvShow: Friends Title: The One with the Birth Mother Season: 10 Episode 9