Mental stick

A thin wooden pole with some sort of metal thing on top, usually is sold at "the cum bucket" or you can pre-order the latest version online.
Side-notes:
is completely different from a knife
Is usually very expensive

Stand back! I got a mental stick and I'm not afraid to use it!

Mental stick by MishonSticks® April 11, 2017

mental cancer 

A severe case of retardation, usually seen in bronies and weeaboos.

Damn, Mike probably has mental cancer from watching all these MLP music videos.

mental cancer by Mentis Debilitatum May 27, 2017

Mental Fred 

(Rhode Island dialect) A meltdown or a tantrum

Gary had to apologize after pulling a mental fred with a customer

Mental Fred by Planet Rob June 16, 2017

mental perv 

People trying to get inside your mind and but flat out fake people just to get you typically happens to women

Hey,his being a mental perv to me recently what should I do about him

mental perv by Jack Napalmer August 18, 2017

mental lol 

When you laugh in your head but not aloud, aka MLol or mlol

Husband: “Aren’t you going to laugh at me?”
Wife: “I did, it was in my head. A mental lol.”

mental lol by Buckeyeheel May 23, 2018

Mental Jackers

Some asshole who comes and steals your thoughts and turns it into their life's work aka Blaqadomas

Some fool who jacked my account and took credit for Cracker naggle then came up with a stupidass word. He's one of those mental jackers.

Mental Jackers by The Original Blaqadomas May 30, 2018

mental cart 

n. When you think about adding an item to your online shopping cart, but don't actually add it.

v. 1. mental carted

I added that oatmeal to my mental cart, but didn't actually buy it. Now I am hungry and have no oatmeal.

mental cart by dawghawk12 June 15, 2018