When someone else orders a McChicken and you fuck directly afterwards while still in the McDonalds.
Person 1: "Hey, is that a McChicken?"
Person 2: "Yes"
Person 1: "Wanna fuck?"
Person 2: "Let me finish my McChicken first."
Person 1: "Let's make it a McChickenFuck"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi