The area between your srotum and rectum... from the mid 1800's when this was thought to be a muscle. In 1879, it first showed up in medical books as Chodimus Maximus, and was later shortened to Chode in 1903. In 1920 it was discovered to actually not be a muscle, but the name stuck!!!
In french it is known as the Taint
and the Souix Indian Tribe effectionately called it the fleshy fun bridge