I was going to post this over email, but I find the less you say over email lists the happier you will be. Still, if you are curious, the etymology of
"colder than a witches tit"

"colder than a witches tit" concomes from the superstition that witches couldn't bear children. Rather, women who couldn't bear children were witches. There is also a second meaning to "witches tit," wich is a third nipple or unusual birthmark which witches used to suckle their familiars with. This cursed mark could also be hidden beneath the skin in the form of a numb spot. Basicly if an Inquisitor wanted you to be a witch they would strip you shave you and stab you with a bodkin needle to find your witches tit. And then they would burn you alive. It harkens back to a day when we lashed out at anything different from the fundamentalist status quo and most of the witches I know find the term offensive. Still, my Dad used to love to say that, and most witches take themselves too seriously.

OK I'll shut up.