Using sick time at work to get a paid vacationbecause you are about to lose your accumulated sick time or because you want days off but have no more vacation time.
I really want to get away next week but I used all my vacation time, I'll just take a sickation.
Usually a teenage girl has a sicksation type reaction to a boy band. (i.e. posters on their bedroom wall, coupled with intimate knowledge of band members dietary preference, pets named after band members, several weeks worth of band nostalgic clothing)