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The sound of disgust coming from a crowd at a sporting event after something they didn't like happens.
The sports announcers reported, "That questionable call by the officials brings out the 'Boo Birds'."
boo birds by ChrisDoc November 10, 2009
Related Words

Birderer 

Anyone who kills a bird whether intentionally or otherwise. For example; a friend of mine hit a bird today.. and instead of calling her a "bird murderer" in the text that I was typing to her, I consolidated and threw "birderer" at her. I actually think it cheered her bird-killing self up a bit.
girl driving car: oh crap i think i just hit that bird
guy passenger: wow it's not moving, I think you killed it... YOU BIRDERER
Birderer by Patrick Mick November 16, 2007

Birdfeeduh 

Similar to a mother bird feeding its babies a worm, Birdfeeduh is when a bunch of girls are swarming a mans dick and fight for his cum. (just like baby birds fighting for the worm)
Stevie ran that Birdfeeduh on some hoes after work thursday.
Birdfeeduh by BP Boys June 14, 2008

pull birds 

To pull birds does not mean 'to look at the ladies'. Obviously MoonKnight has never been with a girl if that is his definition. Pull birds means more than check them out it means cop off with them.
"I've not had a bit of action for a while."
"Don't worry, mate I'll wing man for you."
"Great, let's get out and pull some birds."
pull birds by The Strut October 13, 2004
A lesbian who typically wears pastel-colored clothes made from organic cotton. Birdseed lesbians love granola bars, and spend a great deal of their time connecting with the earth.
I need to let my birdseed friend Carol know about the sale they're having at Whole Foods right now, their sunflower flax granola bars are 50% off!
Birdseed by muonic March 29, 2010

Birdinhell 

A commonly used word in the UK meaning 'to down a drink'. The term was coined in the early 2000's in Nottingham and pays tribute to a beloved pet. According to legend, this pet was fed Creatine (muscle stimulant) until it died from hanging?

The word is also accompanied by an action performed prior to drinking.
"Birdinhell it"
Birdinhell by Birdinell March 15, 2009