A fork of Rural Dictionary
when a weather man/woman predicts large amounts of snowfall for any weekday, but the storm never happens. people typically bitch at each other during first-period the next morning
weather guy- "and on wednesday we're expecting 15 inches plus in your town"
Next day, no snow
Teacher- "well that was a snowday fuck-up if ever saw one"
When you get a snow day and proceed to fuck during that day.
Me and my girlfriend had a great fucking snowday