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The term "boshee" is slang for bullshit, often used in terms of something that is cool, much like "Thats the shit dude!", but is also used for bad situations or circumstances, much like "Thats shit man. Total bullshit."
"Dude, thats some boshee man."

"Hey! That be that boshee!"
by BosheeGetter911 October 14, 2009
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