A sexual position, plot, or game with unknown, but most assuredly nefarious connotations according to people on the left. Also apparently an innocent drinking game in actual reality.
Did you read Brett's yearbook entry about that drinking game Don? Don't tell me Devils Triangle is a drinking game Chris, we all know it's a code phrase for an insidious sexual act or other horrible unspeakable perversion. I have extensive knowledge about such things.

Hey Squi you wanna play some Devils Triangle? I got the quarters if you get the Pabst Blue!
by Re@litycheque October 11, 2018
Get a Devils Triangle mug for your papa Abdul.
A term for a three way with 2 men and 1 woman that couldn't possibly be a game or anything else becuase words only mean one thing.
Can also be a metaphor for people believing what they want to be true.
Regular person: Have you played that strategy board game Devil's Triangle?
Partisan autist: No that can't possible be a game because it's already a sexual practice.
by SneakersO'Toole November 20, 2020
Get a Devil's Triangle mug for your papa Manafort.
A nickname for the Bermuda Triangle. Or an actual fucking drinking game. Modern definition has apparently been changed to a threesome with 2 men and 1 woman. Tbh I don't know what's going on anymore in this world.
Example 1:
Frat Boy: Hey bro, wanna play Devil's Triangle?
Random Feminist: You're perpetuating rape culture!
Frat Boy: I just wanna get drunk...
Example 2:
Guy: Hey did you watch the new documentary on the Devil's Triangle?
Random Feminist: You're perpetuating rape culture!
Guy: I just wanted to learn about the Bermuda Triangle...
by Just-That-Guy-Bro July 21, 2021
Get a Devil's Triangle mug for your Facebook friend Yasemin.
A natural patch of pubic hair. The Devil's triangle runs from the bottom of the waist to the start of the grundle; in other words, it's the part of the crotch that is visible during normal intercourse.
I love your Devil's Triangle.
by AtlanticComputer October 10, 2020
Get a Devil's Triangle mug for your grandma Sarah.