Fangirlistic 

What fangirls are, but typically refers to the really obsessive ones. A derivative of fangirlism, there is no known cure. Possible coping methods include staring at said obsessions, daydreaming about said obsessions, drawing pictures of said obsessions, reading fanfiction of said obsessions, masturbating to thoughts of said obsessions, etc., etc., etc. Uh... yeah.

Random Loser 1: I got an actual nosebleed last night staring at a picture of Levi Ackerman.
Random Loser 2: Bro, get your ass to a doctor. You're fangirlistic as frack.

Fangirlistic by Slightly Anonymous Loser May 26, 2015

Fangirlitis 

(noun) ; a sickness contracted after being in a large area/stadium/arena full of Fangirls. Not fatal but extremely sucky. Symptoms include; sore throats, soreness of legs, headaches and drowsiness.

Dude, after that concert I got fangirlitis! My throat hurts and everything.

Fangirlitis by randomfangirl September 15, 2014