The phrase 'Brass Monkey Weather' refers to very cold weather that is extremely out of the ordinary; cold enough to freeze the tail, nose and ears of a brass monkey.

Indeed, there are two different kinds of Brass Monkeys out there: One is a mixture of malt liquor and orange juice and the other is a premixed cocktail “beverage” produced by the Heublein Company in the '70s up until the '90s, that consisted of orange juice, vodka, and dark rum.

The Brass Monkey is a cocktail made with dark rum, vodka and orange juice, sold as a premixed cocktail in the 1970's and 80's. It was sold by the Heublein Company, which later dissolved in 1998.

Brass Monkey is a brand name of pre-mixed cocktails made by the Heublein Company. As with many lesser-known cocktails that are named after colloquial expressions, widely differing recipes share the same name. In the 1970s, '80s, and '90s, the Heublein Company produced the premixed cocktail labeled Brass Monkey.