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The epitome of awesome. Usually used to describe an event that is remarkably positive in ones favor. Also can be used to describe the immediate boner you get when a chick is super uber hot.
If one makes all of their opponents cups on a rebuddle in beer pong its shwingtastic.

Guy: Dude I heard you fucking in your room last night 8 doors down the hallways!
Guy 2: I know! It was shwingtastic.
by Myles Coch October 05, 2008
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