INSET day

A day off school in England which is mainly used for sleeping and eating or seeing friends
Its used for teacher training
Girl 1: OMG its an INSET day on friday!! lets go shopping!!
Girl 2: OMG yes!!!!
by dr-who-rocks March 09, 2012
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Day-Nightmaring

It's like day-dreaming, but having nightmares instead of dreams.
'What's wrong?' Said the concerned friend. 'Just day-dreaming' she said, obviously lying. 'More like day-nightmaring' The friend said, unconvinced
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Valencat's Day

This holiday is celebrated by those who are alone on Valentine's Day and have an abnormal obsession/relationship with their cat.
While everyone was on a date for Valentine's Day, I spent Valencat's Day watching movies with my cat.
by coffeeandcats January 23, 2013
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J Day

A holiday celebration paying tribute to His Airness on the 23rd of each month, plus an extra J Day on February 3rd (2/3). Commemorators honor his glory by wearing Air Jordan sneakers/apparel, listening to rap music making reference to Michael Jordan, watching/quoting Space Jam, smoking J's when appropriate, and other assorted MJ related activities.
"Picked up some fresh 11's for J Day next month"
"J Day, nigga. J Day!"
by thebonedaddy March 24, 2015
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good day

the same as Fuck you but for 1890's
John how is your wife Dave

Dave Good day
(Dave pulls out musket and shoots John right then and there)
by asdfghjkl1qqwertyuiop2zxcvbnm3 October 27, 2019
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Meese Day

July 1st Holiday Celebration in the Loadout video game community.

This comes from the Loadout Community where a non-native english speaking player was attempting to ask about Canadian holidays and if, in fact, Canada had a day celebrating the "meese species" in chat. After some confusion it was discovered that he was asking if Canada had a day celebrating the moose. It snowballed from there and has taken over the entire community.

Meese Day was first celebrated July 1st 2013.
I'ts July 1st. Happy Meese Day!
by Duran Vega July 02, 2013
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Haagen Days

A special commemorative weekend that marks the existence of the one and only Haagen Dazs ice cream.
During the town’s annual Haagen Days celebration, my cousin was hospitalized for an acute brain freeze incident after ingesting about ten pints, back to back, in one of them there truly insane eat-all-you-can contests!
by Dr Bunnygirl November 29, 2019
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