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!
od uživatele Rod Brock 31. Červenec 2006
A degree of coldness below about 40 degrees.
It's colder than a welldigger's ass outside.
od uživatele arrow_keys 15. Září 2005