Incrediably Awesome; miraculous; great
Dude, did you see that chick? She's fuckin' Boss!
by John December 16, 2002
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adj. meaning extremely cool, awesome, or fly
That concert was sooo boss
by Grace December 23, 2004
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Disingenuous form of address used by insolent little twats, which although ostensibly deferential, actually implies that they don't actually have any respect for you at all.
"Alright boss!"
"Thanks boss!"
by Dr. Klaus Engelmann April 21, 2006
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an employee of the state or county entrusted to guard prisoners; the prison guard, the jailer, the warden, the bailiff. The Man.
An off duty white Dallas County Sherrif Dept. jailer is walking along at the State Fair of Texas with his family, a brotha' yells at him "hey Boss!"
by Boss February 27, 2004
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In a video game the a big enemy at the end of the level. Defeated in the boss fight.
"Holy crap! The boss in the first level of Contra is totally weak!"
by Brian Johnson April 10, 2004
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Cool. Awesome.

An expression from the mid 1950s, which fell from favor by the early 1960s.
Sal Bufardesi let a tremendous binderfender in class one day, grinned, and said "that's boss!"
by Cap'n Bullmoose April 23, 2005
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