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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."
by anon72298 December 09, 2013
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