A severe psychosis caused by prolonged periods of unexpected time indoors, forced upon the patient by forces beyond his or her control. Leading causes include having one's Valentine's Day vacation to Puerto Rico canceled by the freakin' snowpocolypse.
Why's Bob running around the neighborhood naked? Can't he see the three feet of snow on the ground?
Poor dude's probably got SOCF.
Sudden Onset Cabin Fever. It sucks.