The term, orginally, comes from "Sex and the City", where Carrie describes it as the feeling you get when you meet someone you really really like. That sort of lovey, butterflies feeling when you just want to be with someone.
I myself, describe it as the feeling you get when you like someone so much, you miss them as soon as they leave the room, your legs shake when you think about how much you want them wrapped around you and just a simple sms from them, infact the very sight of their name in your phone makes your stomach do a little flip.
Highly addictive!
