Mechanical failure 

A persistent erection that you have no control over, usually lasting over a few hours

Person 1: Man im so tired, I didn't get any sleep last night because I was in so much pain. I had mechanical failure.
Person 2: That sucks man, maybe you should go see a doctor

Mechanical failure by mtfort February 22, 2018

mechanical welfare

Crypto currency electricity profit and the care of equipment . Please note the moral purchase of the product must have some bearing on the use of it despite purchase else money's worthless.

I must get to work or home to my rig the mechanical welfare sits rotting like stig

mechanical welfare by Smarrf March 14, 2018

mechanicability 

Mechanical ability, skills

Does anyone have any mechanicability to fix my lawnmower

mechanicability by TValerie May 31, 2018

mechaniclysm

The apocalyptic moment where robots finally transcend and improve their Artificial Intelligence to such an extent that they are all able to communicate with each other, banding together to finally defeat the humans.

This is a BAD thing.

"Hey Dennis, the whole Internet just shut down."
"Oh shit, don't tell me the mechaniclysm has finally happened...!!!??"

mechaniclysm by bill cauliflower December 16, 2018

Mechanical penis 

When your dick makes a clicking noise

Yo I got a mechanical penis she fell of my dick and broke it

Mechanical penis by JAB0 January 20, 2019

mechanical rodeo bull

mechanical rodeo bull is when your giving your girl anal and slowly push your dick in her ass and say another girls name then you try to hold on for 8 seconds

i so gave her the mechanical rodeo bull last night while i watched zootube

mechanical rodeo bull by jaden schneider October 2, 2020

Mechanicsville "High" School

"High"

I'm so Mechanicsville "High" School right now

Mechanicsville "High" School by Poppin pop May 19, 2021