Older slang, used in cold weather to place emphasis on how extremely cold it is outdoors.
Damn, it's colder than a well-digger's ass!
מאת Rod Brock 31 ביולי, 2006
A degree of coldness below about 40 degrees.
It's colder than a welldigger's ass outside.
מאת arrow_keys 15 בספטמבר, 2005