Informal slang for "an upper class person". Now commonly used in place of the term "posh cunt" in situations where use of this term would be considered impolite or inadvisable.
"Have you seen Fred's flat lately? That new bird he's got is a right posho"
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.