It once happened that Rav Huna was girded (his belt was) with a piece
of straw and was standing before Rav. Rav said to him: What is this?
Why are you dressed in this way? He said to him: I had no wine for
sanctifying the day of Shabbat, so I pawned my belt, and with the
proceeds I brought wine for sanctifying the day. Rav said to him: May
it be God’s will that you be enveloped in silk [shira’ei] in reward
for such dedication.
When Rabbah, his son, was married, Rav Huna, who was a short man, was
lying on his bed, (and owing to his diminutive size he went
unnoticed). His daughters and daughters-in-law came into the room and
removed and threw their silk garments upon him until he was entirely
enveloped in silk. With this, Rav’s blessing was fulfilled to the
letter. When Rav heard about this, he became upset with Rav Huna, and
said: What is the reason that when I blessed you, you did not respond
in kind and say to me: And likewise to the Master? וכן למר? "V'Chen
-Talmud Megillah 27b
Gam L'Mar means "also to the master" (which is where "mister" comes from)
V'chen L'Mar means "and so to the master"; which is the same thing.
Speaking to someone in the third person is considered a mark of respect. (e.g. "Would His Majesty approve?" "Would the Rosh Yeshivah be davening Minchah now with us?") Talking to a respected personage by calling them "you" in second person assumes too much familiarity and could be deemed disrespectful. A student does not address a master by saying "you" since that would assume he is his peer or chummy friend. He says: "How is master?" etc.