The process of removing hair from a yak using a traditional shaving method, typically involving a razor blade, or another sharp tool, to scrape away hairs from the skin's surface.
"Where is Robby today?"
"Robby is busy yak shaving."
"Interesting. I had forgotten that yak farmers had to worry about that this time of year." Robby's girlfriend:
"Yeah, he really needed to shave his yaks."