to squeal or behave like a teenager, no matter your actual age, in response to anything Twilight/Edward/Rob Pattinson related. May also cause shaking, crying, shortness of breath, spontaneous Robgasm, or Jizzing your pants.
I completely fangirled when I saw the pictures of Rob Pattinson as shirtless Edward in New Moon.
by Iadorepugs August 13, 2009
The act of fanning ones hands rapidly near ones face in overwhelming excitement as a fangirl would when meeting her obsession.
I fangirled when I found myself standing next to Nick Lachey at Starbucks!
by Nick111 July 01, 2006