Eating a bunch of laxatives to induce diarrhea. Then diarrhea shitting in a condom. Using the condom to fuck another man (or woman), then sharing the after-sex residue in the said condom with the individual that got laid. The condom can be replaced with a plastic bag if necessary. In cases of true love, it is possible for two lovers to Dirty Philo each other.
Ironically, Nils and his lover, Charlie the Cowboy showered together after Dirty Philoing each other.