What does Badass mean?

Other definitions of Badass:
- A term for a smooth, cool-headed person that gets it done. Originated in the 1950's, when "bad" started meaning "good".
- A cool mother-f-er who doesn't back down.
- A very cool person. Bad means cool here, and ass is employed much like it would be in "smart-ass".
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How to use the term
Badass:
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What a badass.
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I know you're trying to be badass, but could you tone it down.
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In the third act, when the dude jumped off the plan and onto that car to chase the bad guy, that was super badass.
References:
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