Meanings
From the phrase cold enough to freeze the balls off a brass monkey - supposedly a reference to the brass container for cannon balls on a British man-of-war (but this seems to have been discredited).
How to pronounce "brass monkeys":
AU
very cold
Example Sentences
1
It's freezing outside! It's brass monkeys out there!
2
I need to grab my coat, it's brass monkeys in this room.
3
The temperature dropped so much, it's brass monkeys in here.
4
I can't feel my toes, it's brass monkeys on this hike.
5
I should have brought gloves, it's brass monkeys on this ski trip.