A reference to extreme
cold. According to the United States Navy Historical Center, this is a legend of the sea without historical justification. The center has researched this because of the questions it gets and says the term βbrass
monkeyβ and a vulgar reference to the effect of cold on the
monkeyβs extremities, appears to have originated in the book βBefore the Mastβ by C.A. Abbey published in 1857. It was said that it was so cold that it would βfreeze the tail off a brass
monkey.β. The Navy says there is no evidence that the phrase had anything to do with ships or ships with cannon balls.