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(adjective) The act of something spectacular or amazingly mind blowing. I.e, a movie, a sexual endeavor or even a party that was attended.

Derives from an individual who will go down in history as simply amazing, awesome, and Stilley.
That Cosby sweater this girl gave me the other night was totally Stilley!

The Matrix is the most Stilley movie I have ever seen.
by Krodness January 14, 2011
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to be used in conjucture with total shit/total s as a modifying preposition
Hey, when did stilley get here? That was total s.
by hi im bitch August 30, 2004
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