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1) (v.) To act crazy, outlandish, outrageous, stupid or retarded.

2) (adj.) Of or having the quality or flavor of the Beastie Boys lyrics, humor, or style (i.e. having sarcastic or biting humor, a flippant attitude, use of obscure cultural references, quoting or wearing kitschy and outlandish phrases or styles).
Yo, dawg, dem lyrics is Beastie, yo!

Derek got all beastie and saved his head like MCA.

Qwame gets all beastie when he drinks Brass Monkey 'cuz he gets retarded and up peoples faces.
beastie by Tenacious Faulker March 30, 2009
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Scottish word for a small animal such as a mouse or an insect.
Jings! Whit was that?

It was a wee beastie!
beastie by MEAT PIE!!!!!!! October 11, 2008
That new series of vampire graphic novels is BEASTIE dude!
beastie by JavaJaneOhio November 16, 2010
Someone who is really cool, or an absolute beast. Someone who is really good at something. "A legend"
Can be spelt beasty
Also used as beasty boy.
John's an absolute beastie.

He's a beast at football.
beastie by drpecki December 30, 2006
Stands for: Boys Entering Anarchistic State Towards Internal Excellence

From the Beastie Boys
No Example Needed, Buddy.
Beastie by YWouldUDoThis May 1, 2005
term used for best friend or groupie who really catches your eyes. lovable people you want to hang with,; someone you pig out and sleep over with. Someone who you share secrets and winks with
"Hey, you wanna go to my house?," says Annie.
"Of course! You're my beastie!" Karen replies.
beastie by aznblonde3636 November 24, 2007
-noun

1. plural- Group or herd of desperate, unattractive, and/or overweight women.

2. pertaining to that of a person or persons with beastlike qualities, typically of female origin.

3. a coarse, filthy, ungroomed, or otherwise animalistic male.

Origin:

1985-2009; ME be(e)st(e) < OF beste (F bête) < L bēstia

Related forms:

beastly, adjective

Synonyms:

1. See: ROSIE O'DONNELL / ROBIN WILLIAMS
Teresa: "What kind've girls have been messaging you?"

James: "Two hb10's and a beastie." <insert Chewbacca WAV>
Beastie by robinwilliams August 14, 2009