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2.
Jay Day-noun

Relating to a day taken off from work when perhaps one could actually go into work if one had the desire to do so.

(more covert and cooler than a mental health day)

Origin: A Shortening of the Hebrew name Jeremy, combined with the word day meaning "the interval of light between two successive nights; the time between sunrise and sunset:" Coined as a popular phrase by Alan & Kim in 2009.
Alan: Are you going to be here tomorrow?
Kim: I don't know, it's been a really stressful week, I may take a Jay Day"

or

Kim: Is your brother out sick today?
Alan: Yeah, he's out, but I think he's just taking a Jay Day.
by Trixiebeldon28 March 20, 2010
 
1.
March 15, 2010
A day of historical significance, where 2PM's ex-leadja, Jay Park, posted a cover through youtube after almost half a year of absence.
Girl1: OMFG, DID YOU SEE THE JAYPARKAOM VIDEO?!?!
Girl2:I KNOW, I JUST WANTED TO FUCK HIM ALL NIGHT LONG.
Girl3: jaysus bless this jayday
by therandomfangirl March 15, 2010
 
3.
Is the day at the end of the year in the Jagorian Calendar system. It contains no month and there are 2 Jaydays in a leap year.
When are we going to leave? Jayday.... not today and not tomorrow, but Jayday.
by Jay Urbanski April 10, 2007
 
4.
dedicating an entire day, entirely to smoke weed

Jay, or J.. refers to a Joint
the crew and I are gonna skip school Friday and have a Jay Day
by kussssssssssshhhhhhhhhhhhhhhhh January 15, 2012