A term used to show a person's complete fandom and admiration for the Russian born singer-songwriter Regina Spektor
Derived from the song Reginasaurus, which says the disease is " a head ache and a heart ache, And a something and a little bit of a cute gastritis"
It is admirable among fans to be infected with Reginaitis, although outsiders are generally less accepting.
Person 1: Oh man, I just waited 6 hours on line for a general admission Regina Spektor concert while listening to Regina Spektor on my iPod, and it was the best day of my life.
Person 2: Call the doctor, someone has a severe case of Reginaitis!