An intimate sense of warmth, security, and happiness.
That's a rough translation. This is a Norwegian word; the closest English parallel appears to be 'cozy'.
A search will provide many links to descriptions of the feeling. Rather than use one of those, I just posted a pic of my cats.
Another example might have been Saturday's pleasant gathering with close friends: it was cold and rainy outside, but inside we had boardgaming, good conversation, and indulgent cooking.
It's a good seasonal word to know.