What is S&t Day?
"Sick and Tired Day" - A day you take off work because you're "sick and tired" of the crap and mistreatment doled out to you by management and/or clients.
In essence, playing hooky mixed with a little retribution and attitude for management and/or clients. Works well if you're the only one who does a specific job: a good passive-aggressive statement to management.
Tom Warner had been barred from the fancier bathrooms on his own floor, leaving him to the use of the substandard, lackluster bathrooms two floors below. This was just one more example of management's lack of appreciation for his hard work, he thought.
Tom Warner pulled an S&T Day the following day.