Top Definition
A feeling/condition of impending agony and dread; associated with the upcoming work week. Brought on by the P.M. hours of Sunday night and the conclusion of the weekend.
Bradley-Dave: "Why won't you come out to the movie with us, Jenny-Lynn?"
Jenny-Lynn: "Golly, I don't know, Bradley-Dave. I don't think I can. My math test is tomorrow, and I'm feeling Sundaynitis coming on."
by Jenny/Bradley December 19, 2007

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