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A sleepday is a day in which you have nothing of importance to do, and do nothing but lay in bed and sleep the entire day away. Tend to be pretty bad ass.
Nielsen: Hello, chap.
Oliver: Why, hello there. I had quite the sleepday yesterday.
Nielsen: That's fine. Why are you fucking my wife, Oliver?
Oliver: Huh?
by YapmelkXela February 20, 2010
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