Freeze the balls off a brass monkey 

Navy phrase for canon balls. The balls are placed in a round structure called a monkey. The plates had indentations to hold the balls on the bottom layer in place. The base was made of brass. When brass gets cold it contracts and the balls displaced.

It is so cold it would freeze the balls off a brass monkey.

Freeze the balls off a brass monkey by WxDub December 19, 2016

freeze the balls off a brass monkey 

The cannon balls on a man o' war were stacked and held in place by a brass ring on the deck known as a brass monkey. In cold weather the sea spray would turn to ice thus freezing the cannon balls together and onto the ring.

Hence the expression "It's cold enough to freeze balls on a brass monkey" or simply "brass monkey weather". Note that the correct phrase is "on" NOT "off" a "brass monkey". The expression is often corrupted to hint at an association with a man's testicles balls

freeze the balls off a brass monkey by TimB June 12, 2005

talk a tin ear off a brass monkey

To talk incessantly. A colloquialism. Origin. Gert Godfrey or likely one of her ancestors.

Adrian could talk a tin ear off a brass monkey

talk a tin ear off a brass monkey by James B. Beam May 27, 2023

brass monkeys

rather chilly!

"Fookin Hell man, its cold enough to freeze the balls off a brass monkey!"

abbrev. to : brass monkeys

i.e. : its brass monkeys out here

brass monkeys by wankelschnitzel October 8, 2003

brassmonkey 

Referring to very harsh or severe weather

Cor luv a duck, its brassmonkey weather.

Or

Its cold enough to freeze the balls off a brass monkey.

brassmonkey by pillock September 24, 2004

Brassmonkey 

a derek short that is monkey like...has an extremely large cock n balls...likes to make monkey noises in mrs gnaus biology class.. Loves to get his d wet

OMG HE IS SUCH A BRASSMONKEY

Brassmonkey by RODRIGO BAJO April 9, 2009

bassmonkey 

An Ultimate Incredibly uber elite player who is cl of #pwn.cs clan

Bassmonkey you own

bassmonkey by Nirgora February 5, 2003