A ménage à trois in which the ratio of guys to girls partaking in the sexual experience is 2:1. It is the worst ratio to have in a threesome, except of course 3:0.
Tara: "So last night I had a ménage à trois"
Sara: "What's a ménage à trois"
Tara: "A threesome."
Steve: "Was it two girls and a guy, or was it a Devil's Threesome?"