Backside

Backside is an informal term for the rear view or side of a thing. It is also a person's buttocks, or rump of a mammal, ie, the hind part of its body, or bird, ie, its lower back. In board sports, such as in surfing, it is a manoeuver for a rider. For a regular rider it is done clockwise and for a goofy rider it is done anticlockwise.