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A person who has had so much alcohol that they pass out within a short time of partying. The gender of said partier does not matter, nor does it matter if it's the person's birthday or not. Basically being really, really fucked up.
1) A. Woah there, why are you carrying Jarrett out of the party already?

B. He went into birthday girl mode real quick tonight, sorry guys.

2) A. Hey Cody, nice win for the football team huh?

B. Hell yeah bro! Parties are going to be sick! I am definitely going birthday girl tonight.
by Moosenman December 21, 2012
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May 14 Word of the Day
Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy
Person A: Man, that nutcase Martin Bryant guy shot 35 people in Tasmania!

Person B: No, he wasn't a nutcase, that was just a psyop so the government could have an excuse to ban guns.
by Mystikan April 11, 2006
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2
a girl at a party who purposely stands out and expects you to supply her with gifts and alcohol.
Amber was obviously the birthday girl that night.
by jen canary April 06, 2008
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3
A girl who is celebrating her birthday. She is given special treatment for looking sexy af and partying hard.
Guy 1. Ally is looking super cute!
Guy 2. Ya man, she is the Birthday Girl.
by Xxfuturexx September 04, 2018
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4
A girl who will have sex with anyone
"Girl, you shouldn't be handing out cake like it's everybody's birthday. Don't be a birthday girl!"
by DaRealist September 19, 2014
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