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Four eyes

A well-known insult in the Japanese manga and anime world, used on people who wear glasses. The meaning 'Four-eyes' probably came from the two physical eyes the person has, while two more eyes seen on the glasses (one eye on each glass), which makes 'four eyes' in total.
Person 1: Oi, four eyes! Get me melon bread!
Person 2: I-I didn't get my allowance today...
Person 1: *kicks Person 2 in the gut* Hah?! Who do you think you are?
Person 2: *screams in agony * F-four eyes!!
Person 3: *smashes Person 1 with an uppercut*
Person 1: *K.O*
Person 3: Hey Person 2, you alright?
Person 2: *snot and waterworks flowing* T-thank y-you so much, Person 3! Thank you!
by austinhornhead12 January 6, 2021
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copper four

The lowest rank in Rainbow Six Siege a.k.a. The rank you and your slow friend get every season.
“Dude I’m copper four”
“Wow, you fucking suck
by Iranian hacker April 24, 2019
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Four Fingers Up

Four fingers up represents you think I’m leng and love me
did you see him hold four fingers up. He must think I’m leng
by Tommy fury April 10, 2022
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Four

1. When yo homeboy give sum gud dickin (hold up dem finguhs in a four.)

2. FOURnication
3. Home Base (Fourth Base)

4. To Smash
1. Ayy, bro, you FOUR?
2. FOURRRRRRRRRRR
3. Jerry approached Samantha and yelled , "Ready for that FOUR, baby?"
4. Four, bro? Four?!
by cheesedoodlescubed July 22, 2017
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Four Humors Theory

An ancient and outdated medicine theory that states that a being's health is maintained through a balance of four bodily fluids, and an imbalance of such cause diseases. This theory heavily implies that such fluids regulate personalities, and is the basis of the four temperaments (Choleric, Melancholic, Phlegmatic, Sanguine).

The four bodily fluids are composed of:

- Blood, which causes sociable, extroverted, and comedic personality. See Sanguine
- Phlegm (Pus, Mucus, Saliva, Sweat), which causes reserved and introverted personality. See Phlegmatic
- Black Bile (Spleen, Cancer), which causes sad and depressed personality. See Melancholic
- Yellow Bile (Gallbladder, Vomit, Feces), which causes short-tempered, ambitious, and aggressive personality. See Choleric

Therefore, to combat diseases, one must get rid of excess humor, such as bloodletting. Temperature and humidity of the body such as Hot, Cold, Dry, and Wet are implied to be the balancing of humors. Hence, some might believe that this theory is the earliest attempt to understand Homeostasis, the regulation of biological mechanism. Originating from Ancient Greek thinkers and possibly spread as far into China, this theory persisted well into the 19th Century, in which Germ Theory becomes the foundation of modern medicine and discarded this 2300-years old theory.
Four Humors Theory allows for the erroneous understanding of diseases that plagued Ancient, Medieval, and Early Modern times.

Bloodletting is a dangerous practice that was invented due to Four Humors Theory.

Medieval and Early Modern doctors believed that injecting Mercury into the patient will balance the humors, as per stated by the Four Humors Theory.
by Thaxius August 18, 2022
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four fingers up

when you live in an arena and pull teams
girls: oh reya holds four fingers up, she prolly always is at the rink pulling guys
by yup me again June 12, 2022
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four one one

The truth about something
The truth about a person place or thing
The absolute truth on a subject
What is the four one one about how to get food stamps approval
by Granpa Money July 27, 2022
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