Robe day 

The day when you become a super star at your job or got lots of respect from your boss. When this day comes you can totally afford coming to work in robe because you are fucking awesome.

In trading firm: if we make a mil today, tomorrow is robe day.

Robe day by KrolikRu May 30, 2018

Blue robe day 

Any day off that is planned in advance. These days can be used to run errands, visit friends with different work schedules than you or just lounging around the house in your robe.

These days are best utilized on Fridays and Monday's, however taking one on a Wednesday is a nice mid work week break.

All employers will discourage use of these days.

Mike: I have a lot to do this coming Monday. I think I will take a blue robe day
Scott: ummm....ok? Isn't that like calling in sick?
Mike: yes, but I plan on getting a lot done tomorrow.

Blue robe day by WSDC October 3, 2016