An affectionate name for your female acquaintance when she is in a good mood. Referencing the day of the week, Friday, which is, by school children and business people, known as the start of a weekend; thus Friday would reference a start to something positive.
My girl Friday and I went to the movies last weekend and she was pretty psyched to see that new "Snakes on a Plane."
Not sure why this is an actual listing in the standard mailing country list. The Heard and McDonald Islands are a territory of Australia and are located three-quarters of the way between Madagascar and Antarctica. This is completely uninhabited, there are no discernable addresses, however you can always choose this as an option in the "country" list on any standard mailing form.