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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
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