when school gets called on a count of snow and you and your friends go up to the local resort to hit up the fresh powder with no flatlanders or japanese tourists to fuck it up. a perfect day for shredding.
"Hey man theres no school... POW DAY!!!!!"
by boardsport7 January 26, 2008
When you're too hungover to make it through the work day (commonly a Friday) and have to leave at noon.
Powers went hard last night and had to take a Pow Day
by Rohm is Burning February 27, 2016