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It means pretty much anything you want it to mean when it sounds like it fits
Example:"He was screaming like a banchee "or" I was working like a banchee"
Banchee by Bstonebc February 1, 2019
Related Words
Originating in Northern California, a Bancher is one who has mastered whatever it is they do.
That little bancher just kick-flipped a 28-stair.
That guy just got barreled for over a minute, what a bancher.
bancher by polobancher October 11, 2006

banchester 

A historical social soccer game, played by ex pats, in mission district in San Francisco.
Every city should have banchester for ex pats.
banchester by Jippy87 May 11, 2018
A word used to describe reckless, primitive yet insightful BADASS. These types of people usually posses the natural instincts of a Native American and act in the manner of an outlaw. It is not uncommon that you might find a banchee orchestrating illegal activities and/or putting their life in danger to seek enjoyment. Their pleasure resides in highs from natural drugs and the adrenalin rushes they obtain from their recklessness. Banchees are very in touch with their inner spirit and love being outdoors. Never mistake a banchee for a hoodlum unless you wish to be scalped on the spot. :)
That dude that disappeared for a month with nothing but a tie dye bandana, Birkenstocks, and a smile on his face is a banchee!
banchee by thegreaterone November 9, 2012
Someone acting insane like an animal or ghost. Such as screaming, running, or just acting completely idiotic and fake.
That girl Libby is the biggest banchee I have ever seen, all she does is run down the hallways screaming and sticking her butt out like she is cute. She is annoying, don't you hate her? I heard she make her voice sound like that because she thinks it is cute. F.Y.I it isn't!

dirty banchek 

an awkward placement of hairs above the upper lip making not a mustache but a grouping of uncouth follicles. Is now the fashion sensation furiously sweeping the nation. Made famous and fashionable by Matthew Banchek.
"Wow, you might want to shave that dirty banchek, its turning into a mustache."