when two girls and a guy are participating in a sexual act. the guy shits in one girls ass-hole. then the other girl lies underneath her and gets the shits spewed into her face, chest, etc.
"i was with a couple of dirty girls last night and deciding to give em the old peruvian ass plunge. it was gross"
First, you have to wait until this person has to take a massive shit, then you put your lips gently on the anus of a male or female and start out slowly sucking and after ten seconds, piss in the anus of that person. Then put your lips back on that person and suck fastly until the person pushes the piss and shit all over your face.