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marcoism 

The fan-made religion worshipping the anime character Marco Bodt from Attack on Titan.
Person A: hey bro wanna join my religion?
Person B: what’s your religion?
Person A: oh it’s Marcoism, where we worship our lord and savior Marco Bodt
Person B: I’m interested

Marcoisim 

Any word uttered by Marco that sounds almost correct but the actual word means something completely different and is completely wrong for the sentence. It could also be a blatant mispronounciation or a completely made up word or idea used in a conversation.
"spectacle" a "marcoisim"

"I'm a bit spectacle about switching to another program"
Marcoisim by Sandycock April 11, 2015

Marcotism 

Political ideology.

It stands for the fact that persons named Marco are always right.

No matter what Marco says, he is right. Even if everyone think it is wrong.

The leader of such ideological movement must be named Marco.
Guy 1: Mars is smaller than the Sun

Marco: No, it is bigger

Guy 1: No, that's wrong.

Marco: It's not wrong because I say so and I'm the marcotist leader. Marcotism says that I'm always right.

Guy 1: Damn you're right.
Marcotism by Marcotism leader December 9, 2019
The act of using incorrect word craft.
A marcism would be: I DELIBERATED rice in my stir fry.

Marcotism 

Sexual fetish.
Being sexually aroused by My Little Pony merchandise.
Guy 1: Did you see how sweaty and red his face turned in the toy store?
Guy 2: He suffers from a strong case of Marcotism

Marcotism 

When an idiot tries to come up with an ideology centerns around himself.
- Marcotism is the supreme ideology!!!1!!
-Ok retard
Marcotism by MarcoSugerKuk December 9, 2019
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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