A fangirl is mostly described as a woman between the ages of 14-17 with an overobsession for something that is not real, is real (but is unlikely possible to hook up with him), or maybe even both things of the matter. Most of them screams words such as "OMG, HE IS SO HOT" or "HE IS SUPER CUTE BEYOND BELIEF! MARRY ME BABY!"

Not all fangirls are as awful as the ones of the rabid fangirl. Some fangirls can be actually be QUITE smart and cute, and sometimes can even control their extreme OBSESSION for the person of their affection. Most of the times, I am alright with these kind of fangirls.

Also, rabid fangirls tend to also hate the person that is around the person they obsess over.
A fangirl spots Winry (of FMA) trying to fix Edward's (also from FMA) automail:

Fangirl: Ah, that's so cute! <3 You to keep working!
Ed: Oo;
Winry: Okay... *looks ver confused*

On the contrary, RABID FANGIRLS:

Rabid fangirl: GAAAAAAAAAAAAAAAAAAAH!!!! YOU STUPID BICH!!! SLUT GET AWAY FRUM MY MAN!!! EDO IS MINE!!!!!!!!!!!!!! MOVE IT!!!!11111
by Fuyu Tenshi November 4, 2006
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It's a different type of species. They spend most of their time on the computer, tweeting to famous boy bands, multiple times, asking for a follow. Sometimes these wild creatures are seen out in the wild life, but watch out, they don't know what socializing is. Don't go near this species if you have similar hair or clothing styles to boy-bands or are simple "ratchet."
(on twitter)

Fangirl 1: *tweeting* OMG OMG @harrystyles iloveyousomuch #followback be my baby daddy!!!
Fangirl 2: *replies to this tweet* (cough cough) RATCHET A** WH*RE.
~~~~~~~~
(in real life)

Fangirl: OMG LOOK HOW RATCHET THAT TWIG IS, YOU CAN SEE THE SPACE BETWEEN HER THIGHS MY GOD WHAT IS THIS HELL??!?!?! WHO DO YOU THINK YOU ARE?!?!?!?! ELEANOR?!?!?!

~~~~~~
Fangirls ;*
by NayNayDopeyLoveit February 2, 2013
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A female fan with an obession over anime and video game characters, or over real people like the Orlando Bloom or the guys in simple plan. Some may go as far to create cults, fanlistings, and shrines. Contrary to popular belief, not all fangirls are unatractive. Many, especially those who cosplay, actually look semi-normal or even pretty in normal settings. There are some fat and ugly ones, but not every fangirl is. They also enjoy writing fanfiction or drawing fanart. Anime and video fangirls have a habit of glomping.
anime/video game fangirl(online)
Fangirl: *Glomps* Kawaii!! OMG I love Vash. He is so uber hot!!

anime/video game fangirl(real life)
Fangirl: Lookie!! I just got the new Final Fantasy game!! And look I also got this totally kawaii plushie of Kurama! Kurama is my god!

real person fangirl(they scare me)
Fangirl: OMG I need more Orlando Bloom pictures. I must have them! I need more for my locker. Give them to me. If you don't give me some I shall kill you!!! ARG!!!
by Emi August 2, 2004
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Noun: Fangirl.

A fangirl is a girl, normally in the age range of 12-19 that almost becomes obsessed with either a fictional character/actor/band to the extent that they maybe have posters of their desire on their walls, quote them constantly and rave about them to their friends. Fangirls tend to join together in groups to 'Fangirl' with others about the same interests and desires. This may take place through twitter or livejournal.

Verb: To Fangirl/Fangirling
When fangirls uncover a new fact/video etc. about/containing their desire, they may end up with increased body temperature, constant smiling and changing emotions, a loss of bodily control (Waving their arms around, jumping up and down) and squealing to convey their emotions. In severe cases, fainting may occur, for instance, if someone was to meet their desire such as a celebrity.
Two girls walk down the street. One of them (a fangirl) is on her phone when she sees that her favourite person, Ed Sheeran has tweeted about a new show.
Fangirl: OMG OMG OMG I CAN'T BELIEVE IT! AHHHH! (Jumping around, dancing down the road)
Girl: (Weakly smiles) Yeah.... That's great.
Fangirl: Can you believe it???!!!! OMG this is so great! SO GREAT!!
by TooWiseForWords May 8, 2013
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A species of the female race that many are convinced are rabid or mentally unstable, who will scream over any little thing their idol says does or thinks, and who often gather together in packs they call fandoms online with people they have never met, and sometimes these fangirls will even faint from happiness if they see their idol. Never get near one in the same place as their idol, they will deafen you and make you wish you were six feet under with their screams. You'll hear strange babbling nonsense come out of their mouths as the fangirling slowly drives them insane until their brains crack and they freak out completely and that is why you have to be very careful about taking girls to concerts.
Normal Person: Hey look it's One Direction-
Fangirl- EEK EEK OMG OMG OMG SQUEE ONE DIRECTION AAAAHHH AAAAHHHH I LOVE YOU ONE DIRECTION AAAAHHH AAAAHHH OMG OMG OMG OMG OMG OMG EEK EEEEK EEEEEK EEEEEEEEE!!!!!
*hyperventilates and passes out*
*keeps screaming while passed out because, well, you know, they're insane after all*
Normal Person: I CANT HEAR ANYTHING I THINK IM DEAF HAS SHE STOPPED YET GOD I HOPE THIS ISNT CONTAGIOUS
by Kezi December 12, 2014
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A girl who's so obsessed with a certain famous person she goes out and buys their favourite movies and takes up listening to music they like. In some cases, if she likes a reality TV contestant and they sang a particular song on a certain week, she goes out and buys that artist's music
The fangirl loves Asher Monroe so much that when she found out his favourite films, she went out and bought them herself
by younghomie March 31, 2012
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The action of which a fangirl is freaking out over something related to their fandom. Usually it involves the following: Screaming, squealing, crying, other weird noises, threatening to kill someone, and violent actions.
Example: She just read a Levi x reader, now she is fangirling.
by Attack_On_Mockingjay November 27, 2016
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