1 definition by scott gourlay

Top Definition
When a man or lady dips his head into the icy waters of a keg tub (feet held up by two friends) and stays under water until he feels numb, at which time he whips his head out of the tub to shotgun a root beer soda. The headrush of the experience makes the shotgun an easy and rewarding feat.
Tommy was did about 5 dunkaroos at the tailgate, and his best time was about 90 seconds.
by scott gourlay September 19, 2007
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