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A term used to describe a wii game that requires an excessive amount of shaking or swinging the wii remote.
It's a combination of the words waggle and fantastic.
"Have you tried playing Bleach: Shattered Blade? It's waggletastic."

"What happened to your arm?" "I played too many waggletastic games, my doctor says no wii for a month."
by February 27, 2010
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