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1) Maruta translates into the Japanese word for wood or logs.

2) The name of a Hentai comic

3) (commonly) Mad Scientist slang for one or more non volunteer human subjects.

Due to the mad scientists at Unit 731 and their use of the word as a secret synonym for "non volunteer human subjects"

the word will usually refer to "human subject", rather than actual "wood" when it is spoken in an non Japanese non wood related context.
Especially after the film "Men Behind the Sun" in which there is a scene explaining the meaning of "maruta" to a group of young cadets who have not done their homework.

The secret synonym of "logs" was chosen due to the fact that Unit 731 and its operations at a point was disguised as a lumber-mill, plus that most of the experiments would involve cutting up the logs and that these would be put in the stove and burned at the end to dispose of the evidence.

So if a mad scientists conducting some unofficial research asks you to bring maruta, he/she will usually be disappointed if you show up with firewood.

In popular culture:

As with many other Unit 731 related words it is also the name of a band and several songs in the heavy metal, thrash metal and Grindcore genre

4) It can be a Proper noun
"pick up that hitchhiker we are running low on maruta down at the labs"
Maruta by Danmark November 11, 2012
Related Words
maruja • marujan • marjan • Marija • Marijana • Marijane • marijah • Marjana • maruša • manuja
A wonderful pretty girl, that deserves the best boyfriend on this planet.
She might be quiet at first, but when you get to know her better and she'll get comfy with you, you'll find out that she's actually the craziest and best girl ever.
Girl 1: Wow, Maruša is amazing.
Girl 2: Yeah, she is.
Girl 1: I want to be like her.
Girl 2: Yeah, me too.
maruša by nani69 April 14, 2013
Cute , sexy as hell, friendly, loyal lovable.. just everything positive possible in one PERSON..!

Literally Girl that will change your life!! If you have her on your side you'll be happy for the Rest of your Time! She is the BEST FRIEND you can get!
How I feel about this Person

Marija,

my Best Friend,

since you're on my side the Sun is shinig everyday.. when I feel sad, I just need to call you and everything gets better the second I hear your Voice! You're a Beast Girl! No one ever could replace you, cause you are unique and no one is ever getting close to your Level Baby!!

You are indeed the most lovable Girl ever! Spending time with you is one of the best things ever, I can laugh over everything when you're next to me! I would do all, just to see you for a Moment, just to hug you real quick, just for being near you!!!

When I'm in trouble you always give me an ear and listen to me! You give all to make me feel better, to get me out of the shit I'm stuck in!

Thanks for being there for me! I love you more than anything else!!! <3

From your Best Friend to the most adorable Human on Erath, you!!
Marija by ILoveYouMarija January 8, 2019

Marukaite Chikyuu 

The ending song for the first season of Hetalia: Axis Powers. It's basically a happy-go-lucky song about loving pasta and world peace.
Marukaite Chikyuu, Marukaite Chikyuu, Marukaite Chikyuu, boku Hetalia! Marukaite Chikyuu Jitto Mite Chikyuu, Hyotto shite chikyuu Boku Hetalia! Aa hitofude de Mieru Subarashii Sekai Nagagutsu de kanpai da Hetalia!
The most sexy girl you will ever meet, known to blow the minds of many men. Extremely talented and beautiful, eyes cut from stars.

Also known to have a sexy ass
The most amazing girl in the universe. There is no one like her. One of a Kind. Beauty with Brains.
I need a Marija.

I wish I had Marija in my life.

That girl Marija is so hot.
Marija by Butterfly01010173 December 26, 2016
You’ll fall her for brown eyes beaming and her curly blonde hair glowing in the sunset. You’ll fall in love with her laugh, her jokes, the smell of her cologne. Her suave and proud full weigh on her shoulders isn’t difficult to see. She’s hurt. She’s loved. She’s lost. She has been abused by everyone she’s ever known. Including you. You’ll never forget how you mistreated her or how warm her cuddles were, how endless her passion and support were, and how she’d go through anything for you. Her light, her love, her beauty can save anyone’s life. If you find yourself meeting a Maryjayne, cherish every moment and spoil her like the angel she is.
I can’t believe how stunning Maryjayne is.
Maryjayne by PuffiestPixies November 22, 2018
More from Urban Dictionary

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

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026
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