All of midwestern America during the winter, especially Minnesota.
A word-play on the term
nippy to describe cold weather and simultaneously include boobs nonchalantly in the conversation. Often followed by some form of "the breast of weather" to keep the joke going.
Matt: Wow, tid bit nipply out here, ain't it?
Sarah: Yeah, not exactly the breast of weather.
Buy a
tid bit nipply
mug!