The nape of your neck is the back of your neck. If you have a ponytail, you might enjoy feeling it brush against the nape of your neck.
Your nape is the base of your neck, the spot where the back of your hair begins. A low braid or ponytail sits at the nape of a woman's neck, and a shoulder massage often includes the nape of your neck and the base of your skull. The origin of nape is uncertain, though one guess is that it came from the Old French hanap, or "goblet," a possible reference to the hollow at the nape of the neck.