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A euphemism for calling in sick to work so that one may stay at home and fist his or her significant other throughout normal business hours.

This does not require the employee to actually be ill. Instead, a California Sick Day is defined by the act of business-hours fisting, regardless of the health of the participants.
Employee 1: You missed the big meeting yesterday.
Employee 2: Indeed. I took a California Sick Day.
Employee 1: Up to your elbows in shit either way, right?
by Dr. Davis R Buttcheeks III September 27, 2015
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