a group of overly and frighteningly obsessive females who basically worship (a) certain celebrity(ies)- often males, mostly for their look(s).

They would do almost anything to get attention from their idol(s), especially if they are internet stars.

A fan girl can be easily recognised:
"OMG! I LOVE YOU. CAN I PLEASE HAVE YOUR BABIES?"

most common use of fan girls:
- to gain ridiculously high popularity on online websites. E.g. tumblarity tumblr; followers twitter, dailybooth; subscribers youtube; etc.
A: why is your tumblarity so high?
B: oh fan girls, they reblog and like all my posts.
by life lover August 21, 2009
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(N) Girl/boy that has devoted shrines in their closets and candle lit ceremonies of worship to their favorite anime/movie/stupid reality TV show/My So-Called Life character; A person with extreme infatuation and fixation to a fictional or pointless real-life person that will never be real or actually acknowledge them if they exist . . . Only in their wildest Fan Girl-esque dreams.
Yaoi Fan Girls. The most dangerous, blood-thirsty kind. Insult SasuNaru and thou are doomed.
by VeganVampire107 January 23, 2009
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a girl who is obsessed with a band to the point of wanting to sleep with the singer/guitarist/sound tech/other random member, regardless of a 15-year age gap and the engagement/marriedness of said member. see also teenie.
fan girl: OMFG how dar he lyk av a wife he iz mah babeh!!!! we r ment 2 av babies togeva iv named em aftr me n him and evrythin oh THAT BITCH! F*CK HER!! *voodoo*

more intelligent fan girl: Oh get a grip. So what if he has a wife? You have to learn the art of seduction, we just need his address. Look, you're not even doing it right. Stick it in the puppets stomach! Fool!

(thanks to buggeroff for this example)
by Kurarisa-kun April 8, 2008
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A girl who is extremely obsessed with anime and/or manga. Fan girls travel in packs and one can always spot them, for they are loud and obnoxious. Stay clear of fan girls when they are on the move because one can most likely get seriously hurt or trampled. Although annoying, fan girls make the best lovers.
by Raito October 29, 2007
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A sub-category of poser.
A very shallow female who is only a fan of someone or something (an actor/band/athlete) because she wants to stare at cute guys and she dreams about having sex with them. You can spot a fan girl on the internet by reading what she posts on websites:

OMG orlando bloom is sooo freakin hawt!!! I want to have his baby!!! *squeal*

To view comments made by real fan girls, click on the following:
orlando bloom brad pitt billie joe armstrong leonardo dicaprio

Since the dawn of time, fan girls have been loathed by true fans (myself included). It's okay if you think someone is "sexxxy", just don't share it with me!

Half the people who go to Green Day concerts these days are fangirls who never heard of them until months ago. HE'S MARRIED! GET OVER IT!

A comment to all the fan girls reading this: Don't worry, I'm sure SOMEONE will have you.....(heh).
*After watching THE LORD OF THE RINGS*

My friend: OMG!!! Legolas is sooooo damn sexy!!! I'm going to go home and make love to his picture (again)!Lololol!!!

Me: But how do you feel about the deeper meaning behind the plot?

My friend: Don't tell me you actually paid attention to all that filler stuff about a ring!
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A girl who is overly obsessed with a manga or anime usually. They can go on and on....and on.....about what ever.
Fan Girls, In a word, scary! xD
by Sabrina the Awesome June 22, 2011
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A girl that obsesses over a boy band and needs to be disposed of immediately. Fan Girls will typically scream so loud that your ears will start bleeding and your ear drums will be projected out of your ears and flung 2 miles until they land on some old lady's cat. If you ever see a fan girl, run as far away as possible and call your nearest pest control.
MY EARS!!!! LOOK WHAT THAT FAN GIRL DID TO ME!!!!!!!!!!
by Hetler January 11, 2018
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