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Invertible

In linear algebra, an n-by-n square matrix A is called invertible (also nonsingular or nondegenerate) if there exists an n-by-n square matrix B such that:

AB = BA = I (where I is the Identity Matrix).

Otherwise, in life, it refers to the case where something can be transformed into something else and transformed back.
Randy: Sally is so invertible; real marriage material.

Sandy: I know, nonsingularly so. Put a few drinks in her and you can get her on her back and yet in the morning she still gets up and cooks you breakfast.
Invertible by Len Bakerloo July 6, 2016

Untetrible 

When someone is so good at Tetris they can't be beaten by the machine.
"Dude he is untetrible"
Untetrible by Mr Luva June 6, 2009

unvertisement 

An advertisement so incredibly annoying that it actually puts you off whatever it advertised.
I hate those unvertisements where they're having a clearance for furniture or carpets and someone is constantly shouting. They don't make me want to buy stuff, they make me want to find the manager of that place and shove a screwdriver down his ear canal.
unvertisement by Korgmeister April 22, 2006

Undertable Arnie

The Undertable Arnie

A sexual act wherein one partner bends over a chair and is stuffed under a table and acts as if they are "Arnie Grape" from "What's Eating Gilbert Grape", using such classic phrases as; "I could go at any time!" or "I kiled it. Gilbert!" or who could forget "Match in the gas tank, boom boom!".

These phrases are often augmented with mentally challenged sneering and shrieking noises mimicking that of "Arnie" from the movie.

The second sexual partner, of questionable intent, then begins to fornicate with the faux "Arnie". This sexual act is often ritualistically performed as a celebration for 18th birthdays in the midwestern communities of the United States.

Sometimes families throw a party and have cake afterwards.
Hey Pa, did ya hear? Muh sister gave me some good undertable arnie the other day! Ma taught her well!
Undertable Arnie by 500lbs_Mama April 11, 2026

sands undertable 

the sexiest (and laziest) skeleton there is

comes from the hit game undertable by robert fucks
i love sands undertable