Noun: Term for an idiotic 13 year old girl who never gives up. No matter how much you tell them they need to learn grammar or need to open thier mind they won't. Also extremly politically incorrect using terms like "gay" to describe something poor. Cyndars can only exist on the internet.
Boy 1: God, she was talking to me last night..
Boy 2: Who? That Lauren girl?
Boy 1: Yeh she's such a Cyndar.
Boy 2: Damn straight, she needs some correcting.