A term used for topless photos sent by a girl to a guy who would then forward the photos to all his bros via cellphone. Usually associated with frequent Myspace flirting, and often used as a simple one-worded question as a text.
Bob: Bro you have to check what this myspace chick sent me
John: Those are titpics if I've ever seen them!
Sarah: Wow, I don't think I've ever met anyone like you. I think I love you!