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"
Kim: Is your brother out sick today?
Alan: Yeah, he's out, but I think he's just taking a Jay Day.