Lower back tattoo

A lower back tattoo is a body decoration, sometimes intended to emphasize sexual attractiveness. Such tattoos have become popular since the late 1990s, but they are sometimes derided as suggestive of promiscuity and pejoratively referred to as "tramp stamps", "slag tags", "pull out targets", and other slang terms.

While the lower back is not the widest area of the human back, it has abundant space for a large design, and horizontal tattoo designs can be worked easily. In contrast to the abdomen, which is otherwise a similar location, the lower back does not stretch significantly during pregnancy or other weight gains, thus providing a more stable site for a design. Lower back tattoos are often left uncovered by individuals wearing crop tops that are designed to expose the midriff, and low-rise jeans that are worn low around the hips.

Reference: http://en.wikipedia.org/wiki/Tramp_stamp