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general::
Phrase(s): *cold as a welldigger’s ass (in January) [and] *cold as a welldigger’s feet (in January); *cold as a witch’s caress; *cold as marble; *cold as a witch’s tit; *cold as a welldigger’s ears (in January)
very, very cold; chilling. (Use caution with ass. *Also: as ~.) • Bill: How’s the weather where you are? Tom: Cold as a welldigger’s ass in January. • By the time I got in from the storm, I was as cold as a welldigger’s feet. • The car’s heater broke, so it’s as cold as a welldigger’s ears to ride around in it. • She gave me a look as cold as a witch’s caress.
McGrawhill's American Idioms And Phrasal Verbs