A somewhat condescending phrase used when responding to an often ridiculous, silly, or funny statement. It is used to denote to the person who said the statement and can probably be likened to saying "Tsk, tsk" or "Oh brother."
Often a person will shake their head, laugh, or point when saying it.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.