Top Definition
Girls who place their birthdays as the most important day of the year not only for themselves, but also for everyone they know. They expect all their friends, family, and acquaintances to drop whatever they are doing in order to make her birthday the best day of her life. Every year. Usually applies to spoiled bitches a.k.a. birthday bitch.
Victoria: OMFG. Why can't you come to my birthday?
Charles: I'm sorry, but I have to attend my sister's wedding.
Victoria: WTF. You asshole. How is that more important than my birthday?
Charles: Bitch, stop being such a birthday princess.
by roflwaffle. November 12, 2009

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