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When your co-worker(s) mysteriously become sick before a holiday. Usually a lazy worker who doesn't want to work before a holiday because he or she would rather be home. A worker who makes up a sickness of some sort to cover for his or her lazy intentions of really not being sick.
Geez, that guy Kinty has really come up with a case of Holidayitis

Q: Where is Kenny?

A: Isn't he sick?

He's not sick, he has a case of Holidayitis
by Lou64 January 01, 2014
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