A combination of something being Sick (really dope) and Nasty (really stylie). Used in the Ski and Snowboard community to describe something someone did that was mind blowing.
Damn, You see Warner huck that cliff, that was soooo sicknasty!
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Another and better word to say how cool, hawt, and awesome something is and will always be better than the word 'cool'
Megan: Did you see that Yeti? It was like, uber sicknasti!
Renee: I know!!!!
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Cuz the word cool is mega gay now. DONT BE GAY OK OR CALIFORNIAN.
Hey man your shit looks so sicknasty
Sicknasty, or sometimes sick nasty, is a a phrase to describe coolness or agreement.
It would be sicknasty if you met me at 8 tonight
The transformer has a sicknasty laser gun
Person 1: "Hey, I got my photo's printed!"
Person 2: "Sick nasty"