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 August 19, 2015
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Condition that occurs starting at midnight the day a new video game is released consisting of fake flu or cold like symptoms reported to your boss, teachers, or parents. Popular games such as the Call of Duty, Halo, and many sports game series, have multi-player online gaming and every second matters to international rankings. It is very common for any gamer to get "sick" to take off school or work when a new popular game is released.
James, "COD Black Ops II comes out 11/13/2012, I can't wait!"

Joe, "Are you going to have "gamer sickness" and miss work again like when Halo 4 came out a few weeks ago?"

James, "It's a "gamer sick day", and yes I feel like crap already, I think I have the flu."
by TuckDCconnect November 12, 2012
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The act of calling in sick to work after a night of getting royaly shit-faced hence the Irish Sick Day aka the Irish vacation day.
I know Tony was fucked up at the club last night he must be pulling the old Irish sick day.
by Mark McNamara March 18, 2006
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Greg - "wake up man you gotta go to work"
Bryce - "nah man I can't it's Irish Sick Day"
by Crap Factory November 19, 2008
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When you pretend like you are sick all day but then someone asks you to go out at night and all of a sudden you're all better.
Day: Honey, I'm so sick. You take care of the kids.

Night: I'm feeling a little better. Joe asked me to go to the bar. See you later.

Wife: I thought you were sick
Husband: I was just day sick.
by mcoop21 February 7, 2017
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When a geek takes a sick day, personal time off, or schedules a day off of work to coincide with the release date of a new game system or game.
David: Hey Chris, can you work a trouble ticket for me on Friday?
Chris: Sorry Dave, I am not going to be at work that day due to the Xbox One release.
David: Oh.. thats right, I forgot you were taking a geek sick day.
by IT Wizzard November 23, 2013
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