During a threesome with 1 man and 2 women, one woman is riding the mans penis while the other woman is sitting on the mans face. The women will kiss thus making a triangle.
I was part of a Devil’s Triangle with these two chicks, one rode me while I ate the other out!
A threesome involving 2 men and 1 woman. Generally one man on each side of the woman who high five after achieving climax, creating a "triangle" type figure.
What you claim is a drinking game when you're a Supreme Court nominee who doesn't want to admit in public that you and another guy both fucked a girl at the same time.
Senator: Judge, what does the "devil's triangle" entry refer to in your yearbook?
Judge: Sir, it's a drinking game.
If this next nominee to the Supreme Court is confirmed, there is a strong possibility a Devil's Triangle will have Washington, DC locked up for the foreseeable future.