Period Mech 

The goopy stuff that comes out of girls you know whats when they get their period / monthlies / rags

Mech is pronounced like meck.

dude, so much period mech was in my undies just before.

Period Mech by LMonsta December 8, 2009

Pop Mech 

Short for the magazine Popular Mechanics.

I just read the new issue of Pop Mech.

Pop Mech by BlueDice November 14, 2021

Lego mech 

when you make a Lego mech that u play with until u need more parts

man 1: I wanna make a LEGO MECH
man 2: ok u degenerate

Lego mech by PikaboyMOD February 4, 2022

Beck the Mech 

Refers to the word MechisBeck from the middle ages, meaning that Beck is Mech and Mech is Beck. Meaning the person in question likes straight hair and other perfectly straight things or objects.

" Oi Beck the Mech! Why Mech?"

Beck the Mech by Imakethebestwordsshutupfamjam October 13, 2020

backyard mechanic 

Someone who works on & fixes cars on their own property.

John was quite the backyard mechanic & spent decades fixing cars, his GTO especially.

backyard mechanic by Starchylde June 15, 2016

Fluid Mechanics

The one area of physics where its researchers are actually mostly mathematicians.

Ed: Ey Bob I am studying fluid mechanics
Bob: You mean the area of physics you see mathematicians and engineers study instead of physicists?

Fluid Mechanics by EpicScientician September 17, 2021

Mechatronics 

A mistake.
A program that lures innocent high school kids who want to make cool robots. Half the class end up becoming web developers.

"So... you transferred from ECE to Mechatronics?"
"It was a mistake."

Mechatronics by 6011304 March 31, 2019