Top Definition
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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