Triangular Orgasm 

When a narcissist masturbates in the center of a triangle made out of three mirrors so that they can see every angle of themselves.

“We don’t kinkshame, but I heard that pythagoras was into triangular orgasms”

Triangular Orgasm by Gordon Gable March 14, 2022

Bermuda Triangulated 

Disappeared. Vanished. Gone. Lost.

As far as I know, the term "Bermuda Triangulated" first appeared in Chuck Palahniuk's book, "Diary." Which to date (Jan. 27, 2007) is the best book I've ever read.

(An exerpt from "Diary" (Chapter) June 23, pg 6):
A woman calls from Seaview to say her linen closet is missing. Last September, her house had six bedrooms, two linen closets. She's sure of it. Now she's only got one. She comes to open her beach house for the summer. She drives out from the city with the kids and the nanny and the dog, and here they are with all heir luggage, and their towels are gone. Disappeared. Poof.
Bermuda triangulated.

(Real life example):
I had just gone over to the DJ to request "Brighter Than Sunshine" as a slow dance song for Miranda and myself. But when I got back to where we had been standing in the center circle of the gym floor she wasn't there. She had Bermuda triangulated.

Bermuda Triangulated by I listen to Indie Music February 1, 2007

triangularsquaredpentagonalhexagonedtektraktys 

Shape

Rated propercase rested become nestedassociated images recognising roots of routed incompleteness of binges, drawing linear circle respecting aspects endeared three dimensionally completes triangularsquaredpentagonalhexagonedtektraktys reference tolerance cheered.

triangularsquaredpentagonalhexagonedtektraktys by Hercolena Oliver June 17, 2010

Triangulate 

A way of determining the position of something using mathematics and/or technology. Most commonly used by people who don't know any trigonometry.

I triangulated its position.

Triangulate by Engineerd July 2, 2019

Tribangular

Something relating to having threesome sex, or as good as threesome sex.

"Hey man, how was the party last night?"
"You shoulda been there! It was tribangular." (Meaning he had a threesome there, or it was as good as a threesome)

Tribangular by Vipper January 17, 2008

Triangular Vagina 

A formation in beer pong in which the cups are lined up in a triangle, 3 in the base, 2 in the middle, and 1 at the top.

“Gimme the triangular vagina!”

Triangular Vagina by PongKing69 March 8, 2021

triwangular 

Excluding gay men and female penis enthusiasts, this is widely considered the worst kind of threesome.

TONY: "ouch that hurts!"
PHIL: "shoot, sorry Tone I was aiming for Kathy"
GREG: "Kathy?....Kath?....wait...turn on the light for a second.......Gosh darn it! We've been going triwangular again."

triwangular by benwithacapitalb January 8, 2012