V. To make loud high pitched noises (this includes squealing, yelling, or talking so quickly that it doesn’t sound like they are actual speaking a real language) or show their excitement for the object of their obsession though movement (this includes jumping glomping, running in circles, etc.). Fangirling involves a lot of physical action unlike fanboying and can be quite annoying.
One does not have to be a girl to start fangirling though most girls do.
Also see fanboy
I was fangirling so much I forgot to breath.
2. a gathering of two or more fangirls in which they proceed to waste endless amounts of time ogling, discussing/arguing, stalking, etc. the object of their "affection"
fangirl, glomp, squee, groupie
LoL, did you start fangirling the minute you found out the title of the next Harry Potter book?
2. Yeah, I stopped by Aisha's yesterday for a bit of fangirling before I headed home.
Who knew the Halloween party was going to turn into one huge fangirling session?!?!
Has been used in the past as derogatory but has become less and less in certain fandoms. Fan girling frequently happens with large amounts of squee.
The noun would be fangirl or occasionally fengirl, though the later is usually used as plural.
James: Yeah, she started fangirling the second she heard it!