A secretly scheduled day when all high school seniors skip school and do something else. It is usually around the end of the school year, and it is usually on a day where nothing is really happening, or around a holiday.
Senior #1: Hey, when is Senior Skip Day?
Senior #2: Johnnie told me it was Friday, May 15th. What should we do that day?
Senior #1: I don't know. Maybe we could see if we can drive out of town for the four-day weekend
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