When a person reminisces about or uses things from the past, could also be seen as nostalgiafagging.
Jane: I'm using Windows Vista on my computer. I miss when operating systems used to actually be good and have nice design, everything is so boring now.
Karl: Hey guys look at Jane, she's once again waybacking again.
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.