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1.
A style of clothing. A modern mix between "style" and "easy."
I like your style, what do you call it?

I like to look laid back but put together. My style is steasy.
by Holicious November 06, 2008
 
2.
Smooth or buttery. Used as an adjective and rarely as an adverb.
Dude, that wave was so steasy!

The surface of his brand new car was so steasy.
by A Drunk Panda October 02, 2007