While having unplanned anal sex in the dark, (person) 1, rides (person) 2's penis and if 2's penis happens to come out, 1 places it back into his/her own anal cavity and resumes the activity with 1's hands on 2's chest, neck, and/or arms. When the activity has finished and the light comes back on, both parties will find that bowel excrement has been smeared all over 2's chest, neck, and/or arms.

When you eat dirt for the first time and leave your family to build a shack in the woods