2) the flighty exciting feeling you get when you think about/see the object of your affection.
3) romantically excited (i.e.: aroused)
4) the ever increasing acceleration of heartbeat and body temperature as a result of being engulfed amidst the exhilaration and joy of being/having a romantic entity in someone's life.
2. the way birds and other animals act during mating season (as seen in Bambi)
2. "The birds gettin all twitterpated," said the owl. (Disney's Bambi really is a good movie.)