Nature's Bidet

a naturally occurring spring or geyser one uses to bathe the genital and perineal areas of the body

Unhappy Camper: I forgot my toilet paper when I came to camp at Yellowstone and now i have to poop but there's only cacti to relieve the poo from my bottom. What should I do?

Local: Well you should use Nature's Bidet. Go poop on that mound over there and don't get up until 35 or 120 minutes have passed.