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A drinking game involving drinking a beer every 30 minutes for 12 hours. You must finish each beer before the beginning of the next 30 minute increment or else a penalty beer is awarded. Invented at the University of Texas circa 2007.
We tried to complete a power day, but 24 beers was too many.
by cstevens2010 July 30, 2011
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taking one shot of hard liqour, every hour, for 24 hours straight without sleeping. (drinking in between is encouraged but optional)
"Yo Captain, fuck power hours, lets do a power day and get fucked up"
"I'm game"
by Captain Karl March 12, 2008
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