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1.
Adj. A word used to describe anything that is wonderful or fantastic. Derived from the word "sushi": the ultimate "cool" food. Multiple "o's" can be added to add to the effect.
Bob: I went to a fun party last night.
George: Swooooooooshie.

(example 2)

That rug is swooshie!
by Lina June 11, 2003