Top Definition
When an important project or paper is due for school you suddenly become violently ill and skip the class.
They start out with skipping just the class that the paper/project is due in, and slowly move on to one or two periods and then a day, once they've done it a few times they usually start to plan ahead and miss a day before the paper or project is due for convincing.
It is similar to hooky but not really because when someone is "Nick-Sick" they take the time they gain from skipping school or class to work on their paper or project and gain an unfair advantage from the extra time.

Example 1:
Student1: Man i was up till 2 a.m. finishing my senior paper.
Student2: Yeah me too it was hard thankfully its due today and we don't have to worry about it any more.
Student1: Wheres "student3"?
Student2: I don't know the bastard is probably Nick-Sick

After it is known that someone is frequently Nick-Sick
Example 2:

Student1: Whats due today?
Student2: Dunno, Must be something big, student3 isn't here today

Example 3:

Student1: Wheres student3?
Student2: Paper due 3rd period
Student3: Ah, of course
by Overt Jackel October 17, 2007

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