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.
A small piece of information. Derived from the word ken, used often in the scottish language and is synonymous with knowledge.
Person 1: "Hey I don't get this shit. How do you solve this problem?"
Person 2: "I got that one. Give me some kenlets on this assignment and I'll help you w/ that one."