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n. A day dedicated entirely to sex. Generally on a Saturday or Sunday.
Steven: "Hey, wanna go to the beach on Saturday with me and the family?"

Joe: "Sorry dude, Jessie and I are having a slamday. We've already got it on the calander."

Steven: "Can I come?"

Joe: "No. That's just weird. Don't talk to me."
by Jbofantastico February 21, 2011
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