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Mechanical Stop 

The name given to a person's nose when, during a deep throat of a penis, it bottoms out on the pubic area befor the lips do.
"She could have choked down my entire length, but her mechanical stop left two inches of bare shaft visible."

quantum mechanics 

A branch of physics in which the measurable qualities (position, momentum, energy) of a system are described by "observables." The system, upon measurement by the given observable, after being in a superposition of multiple states, collapses into one of a variety of states allowable by the Schrodinger equation. The exact state the system collapses into, is probablistically determined.
X|s1>=x1|s1>

In this example, |s1> is the system being "measured" by the observable X (X denoting the position observable, allowing us to see where the system is within space.) We obtained |s1> as a single state, from a previously superposed (|s> = |s1>+|s2>+|s3>+...)state through an earlier measurement, which collapsed |s> into |s1>, and allowed us to measure the value x1 for its position. In quantum mechanics, all of this information is encoded in the language of vector spaces, as well as linear algebra, and expanded into whats known as a hilbert space (can be thought of as an infinite dimensional vector space).
I'm probably going to get all thumbs down for this, but that's cool, you guys are all the same audience that jerks it to youtube, and probably added a new definition for "poop" or something stupid like that on this site.

quantum mechanics by JP2269 October 20, 2006

attention mechanic 

creative content provider for online and/or offline media
attention mechanics are the guys behind all the internet buzz created around the world
attention mechanic by kelamist August 10, 2018

Scrap Mechanic 

A game made by the company named Axolot. It started really early on as a prototype for Minecraft: Xbox 360 Edition, but it ended up becoming what you see today.
I played Scrap Mechanic for 5 hours straight yesterday.
Scrap Mechanic by es em kay May 20, 2017

Magical Mechanicus Moment

That moment when, after working for a long time on a technical project, you realize you can no longer fully remember how it works
"You might even have a magical Mechanicus moment, where after dozens of hours playing you're not entirely sure how the factory works anymore"
- MandalorGaming: Factorio Review

Mechanic 

The first person that you want as a friend, the last person that you want as an enemy.
Joe: My Trans Am's pretty sweet but I really don't know diddly squat about cars. I need to befriend a good mechanic so I can keep her running sweet.

Jon: I punched a dude at the bar last Friday. Little did I know that he would be the mechanic that would be doing my brake job last Monday. Now I'm laid up in the hospital with a fractured skull and my car's somewhere between a crusher and a foundry.
Mechanic by Yeret March 12, 2017