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1. Soul. As defined by Scientology. Derived from the greek letter theta for thought or life or the spirit.
2. Thetans are needed to animate a flesh body.
3. According to Scientology you are full of "body thetans" - degraded thetans who were once people but are now clustered together along with you and inhabit your body along with you. You are the leader of these thetans.

75 million years ago there was supposedly a ruler of this part of the galaxy named Xenu. To cure overpopulation on all the planets he controlled he summoned the people with psychiatric conditions in for an income tax audit. There they were instead paralyzed by injection of an alcohol and glycol mixture into their lungs. They were packed up in refridgerated units and loaded onto space-craft and taken to Earth (called Teegeeack then) and packed around the bases of a few volcanos.

Then their bodies were all destroyed by nuclear explosions. After this the thetans who were flying around in the winds were caught in electronic beams and frozen together in blocks. Then they were taken to huge 3-D cinemas and shown forms of what life should be like on Earth. After that they supposedly clustered together with a lead thetan in charge and they ended up inhabiting bodies in these clusters. Hence although we are a single thetan we supposedly have about 2,500 other lesser "body thetans" attached to our own thetan self.

The dysharmonious relationship between you and your thetans is what causes all sickness and disease in the world.

If you join Scientology, and pay thousands of dollars, you can go through the process of freeing yourself from these body thetans at huge monetary expense.
I know why I have cancer! My thetans are flaring up again. Better fork over some cash to the Scientology folks so that I can be rid of this disease and my entire life inheritance.
thetan by The Troll August 7, 2005
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themangokid 

A twitch streamer that plays whatever he feels like playing.
TheMangoKid played Brawlhala.
themangokid by thechilldylan November 25, 2020
Related Words

Theranos 

A defunct health care corporation invented by Elizabeth Holmes that was once considered revolutionary in conducting blood tests that required only a finger-prick but there was one big problem; it was too good to be true. It was a big sham. The technology was worthless (engineers with their PhD's couldn't get the blood testing equipment to work), the tests were highly inaccurate (one example; a patient complained about ringing in her ears, Theranos test said she was at risk of having a stroke, her doctor thought something seemed off, gave her a real blood test and it turned out the symptoms were just the result of insomnia!), investors were mislead despite a boatload of red flags (Theranos never demonstrated the technology and showed them the labs. Investors just liked the cool idea of a test requiring just a drop of blood), the company was tyrannical chaos and mistreated their employees pretty harshly, etc.

Holmes and her equally scummy partner/sugar daddy Sunny Balwani have been indicted for wire fraud. Just read the book "Bad Blood: Secrets and Lies in a Silicon Valley Startup" by John Carreryrou if you want to get the full details. A must-read.
I'm just glad I never got sick and relied on a Theranos blood test. I might have died!
Theranos by Soul_Driver January 18, 2019

theta boo 

Any man who is in a relationship with any amazing woman of Theta Nu Xi Multicultural Sorority, Inc. This man is devoted, loving, caring, etc. He will do anything and everything to be with an exquisite Theta Woman.
Man#1: "You datin' that girl from Theta Nu?"

Man#2: "Yeah, why?"

Man#1: "Dawg, you done turned into a Theta Boo!"
theta boo by thetaboo4life January 20, 2009

delta theta 

The semi-universal symbol for therianthropes. Looks like a delta weaving in and out of a theta. Some therians customize it by putting their spirit animal on the inside.

See therianthropy, therianthrope, therian.
1: "I got a kick ass delta theta tattoo the other day."
2: "Sweet, does it mean anything?"
1: "Mind your own business!"
delta theta by Marrok August 13, 2007

Theta Phi Alpha 

Theta Phis are the most real girls in any sorority. They are sweet, kind, caring, and crazy intelligent. They are leaders in on and off the campus representing true Greek Life. Not only are the all around bad-asses but they are the most crazy fun sorority girls you will ever meet. They are the beautiful girls you take home to mom and then they out drink your dad under the table, because they already out drank every fraternity. Never sober, always true are the theta phis, known for holding their liquor with class. The penguin best represents them because they travel in packs, mate for life, and are always dressed for a party. Do not try and mess with a theta phi girl because if you mess with one you mess with the entire sorority. There sisterhood is the strongest, truest, and proudest of the greek tree. They would never bad mouth their sisters and are always there by there side. Every loyal, ever lasting are the Theta Phi Alpha girls.
Dude1: Wow, you would be a perfect Theta Phi Alpha. You are smart, beautiful, sweet, outgoing, and crazy fun!
PNM: Thanks! Its only the dream to belong to the best sorority on campus.
Slang for awesome and/or cool
"Man that backflip was so theta!"
Theta by AngryChameleons March 11, 2021