What does "May a Band of Nomadic Barbers Gang-Lather Your Sister" mean?
I am reading an article about an American microbiologist Carl Woese at university of Illinois. It says that Woese liked to exchange letters with Dr Harry Noller at California. Some of these letters are rubber-stamped with Woese's favorite statement: "May a Band of Nomadic Barbers Gang-Lather Your Sister".
What does that sentence means?
I have found this sentence here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4008555/
Thank you very much