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1.
to go "scooby do:" to twist the head in an upward "rrrRRRRR!!" motion, at the same time saying "rrrRRRRR," having just realized the obvious.
"Dude,when he realizes that's not a bottle of Corona, he's gonna' go scooby doo.
by Rev. Dr. Swami Sez August 01, 2005