huhuhihu can be used in various situations, such as when you're feeling especially happy when greeting somebody, when being filled with happiness because you're really looking forward to something great or as a meaningful way to contribute to a conversation. Derives from "huhu" and "hihi".
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.