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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

Mariotard 

Unintelligent beings who think mario is so strong that he can beat anyone, even though he is just meant to be a plumber that jumps high and gets powerups. They use the smallest details to make mario look strong, and think adding -tard to the end of anything makes it an insult (see sonictard, so people do likewise to them. Most do not listen to reason, or logic.
"No, Mario does not beat Goku you Mariotard."
"Why the hell do you think Mario beats the hulk? Are you a Mariotard?"
Mariotard by RealDeaI July 19, 2015

marital outsourcing 

Outsourcing is farming work out to an external entity that can do it cheaper or more effectively. Marital outsourcing is the same concept applied to marital relations. Numerous service providers are able to perform services on demand often more effectively and at a lower "total cost"
David: What was Eliot Spitzer thinking?
Mark: Marital Outsourcing. Better service, lower cost.
David: Lower cost? He spent thousands of dollars!
Mark: You ever calcualate how much us married guys pay on a per event basis?
David: Touche.

One of the nicest people you will ever meet. Is always there for you and gives the best advice. She’s gorgeous and her tits are perfect. Some people can’t handle her since she’s so amazing and many people get jealous. She’ll always be there for you and you should never doubt her because she’s a bad bitch and she’ll sort you Tf out.
“Oh my god, who is that girl, she’s so pretty
“Oh that’s Mariuca”
Mariuca by Yelloworangutang December 22, 2020
Marieta.. wow! Marieta's sure are unique. They aren't always the quickest one to get the joke but man, they sure are smart with the books. Give em' a glass of wine, a few ice cubes and the party is started. Despite their 3D beauty marks, often on their face, Marieta's are overall beautiful (especially when they wear the red lipstick). If you take a Marieta to the Italian Night Club on 5th, you'll see just how fun she can be.
Dude 1: Look at that mole
Dude 2: Dude, it's ok shes a Marieta
Marieta by fratkm7 May 12, 2014
A girl or woman's name. Derived from Mary.
Common name in Finland.
Maritta Hallani is a famous singer from Lebanon.
Maritta by Fiddlededee April 6, 2017