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brass monkeys
Short for "It is so cold it would freeze the balls off a brass monkey": It's brass monkies this morning.
Contributor's comments: We used the term "Brass Monkey weather" in the 1940s and 1950s in Melbourne to refer to very cold days.
Contributor's comments: 'Brass monkey weather' was used in SA and its use increased during the 70s or 80s due to a beer/ale commercial on the radio and telly - Cooper's Stout I think.