Moose milk from what I've read is a drink that originated with the Canadian military. It seems to be an eggnog type of winter holiday drink popular in Canada.
It usuualy involves rum, Kaluha, vodka, ice cream. There are lots of variations
This link has the best article I found about the drink's history.
It is part of the annual New Year’s Day Levée, an event attended by the Governor General, the Lieutenant-Governors of the Provinces, the Military marking the new year.
The beverage served has evolved over the years.
In colonial times it was “Le Sang du Caribou”, or Moose Blood, heated wine with added spices and alcohol to make it palatable. Wine often soured during the long ocean voyage from Europe. The article states
"Under British Colonial rule, many of the customs of French Canada were retained but, in the case of “Le Sang du Caribou”, whisky, which traveled better, was substituted as the basic ingredient. This was then mixed with goat’s milk, and flavoured with nutmeg and cinnamon to produce an Anglicized version called “Moose Milk”. Today’s version of Moose Milk, in addition to whisky (or rum) and spices, uses a combination of egg-nog and ice-cream and sometimes an additional alcoholic refinement or two."
It is a terrific article with so much more about food and beverages and history. There are a few variations of the recipe as well, Navy, Army, Canadian Air Force.
There's a very funny warning about the effects of moose milk (When it kicks in, among other things, don't try to actually milk a real moose).
What is your recipe for moose milk and let me know a bit more about when you drink it and any history you might know. Thanks.