When two people who don't have an STD have a threesome with a person who does have an STD; the infected participant is the patty and the two non-infected participants are the buns in said Saucy McMuffin.
Paul: "You do know that she has chlamydia right?"
Will: "Well shit, looks like Steve and I were the buns in a Saucy McMuffin."
Paul: "Yeah, you two were super drunk last night. You should probably get tested. There's a clinic over on Hillside."
Will: "You're right, it's probably for the best. I'll text Steve too."
An instance in which a man and a woman are engaged in intercoursems the man proceeds to dress up as a firefighter and lather himself with pizza sauce. The idea is for the woman to add as many ingredients to the man as she would a pizza, and then eat the ingredients off the man.
"You want me to grab the cheese and jalapeños?"
"Sure I already have sauce for the saucyfireman"