rusty hike
A Rusty Hike is when a person inserts their toes into the anus of another person as they defecate, forcing the feces through from between the wiggling toes. Typically the foot is left unwashed and the person whose feet were defecated on will continue to walk around barefoot like this for hours after the act.
"Babe, I'm feeling kinky tonight and feel like trying something new. I vote for Rusty Hike."