Fangirl Syndrome
The point at which fangirling becomes a personality trait rather than moments of weakness when seeing something or someone relating to their "affection".
She has come down with Fangirl Syndrome. We have lost her to the fandom.
Retarded Fangirl Syndrome
What happens when 80% of the fangirl population sees something cute like a character match-up and/or is reading a yaoi. Requires lots of flailing around, making kitty faces and screaming "OMIGOD!" or "SO KAWAII!"
Did you see Samantha back there? I think she was diagnosed with Retarded Fangirl Syndrome after she saw that Maka X Soul match-up.