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The vigorous shaking back and forth of ones head after a particularly unsavory thought, as if to shake the image away.
"Dude, I totally walked in on my mom and dad Doing It!"

"At least it wasn't your Grandma and Grandpa!"

vigorously shaking head back and forth "Ewwww!!!!" *mindshake*
by elleffe August 25, 2011
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