A happy trail on a woman refers to the line of hair that grows between her belly button and her pubic area.
Essentially, it's a natural occurrence where some women have a noticeable line of hair extending upwards from their pubic hair. The prominence and thickness of this hair can vary greatly from woman to woman and are often influenced by genetics and hormone levels. Some may have a very faint and sparse line, while others may have a thicker, more defined trail. It is a completely normal physical characteristic.
