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Halcyonic Planet

Any planet in a halcyonic system (i.e. KMT-2020-BLG-0414L b, WD1054–226 b, WD 1856 b, etc.)

There are also halcyonic dwarf planets, the only example of which is WD 1145+017 b.
In 2020, we discovered the first halcyonic planet around a white dwarf.
Halcyonic Planet by An_Idot September 21, 2024

Halcyonic System

Any solar system orbiting an object that was once a main sequence star, but isn't anymore (i.e. black holes, white dwarves, red giants, magnetars, pulsars, etc.).
The solar system will become a halcyonic system as the Sun dies.
Halcyonic System by An_Idot September 21, 2024
Meaning a period of time in the past thought to be peaceful and pleasant
Halcyon by Girei August 10, 2018

Halcyon Days 

Almost literally means the "calm before the storm", but can also be used to signify joy, tranquility, etc.
Halcyon Days by Kaba April 17, 2008
An all around great person who is always willing to listen and checks in on you. They're an amazing person and be happy if you have them as a friend. Their name shows their uniqueness and individuality. As well as their peacefulness that they hold.
Damn hanging out with Halcyon was so nice. I gotta hangout with them more.
Halcyon by hollow_gravity♡ June 29, 2021
sleep pill, makes u pass out in about 30 seconds
wow i just took this......zzzzzzz
halcyon by Zer0 Racer January 26, 2003
More from Urban Dictionary

Plate of Brown 

A plate of brown consists of foods that have little to no nutritional value, and are typically deep fried. A true plate of brown will also be accompanied by a dark soda.
Wanna go to meal hall & grab a plate of brown?
Plate of Brown by Cheddar Craigson September 18, 2020
Word of the Day on October 22, 2026

Larpenomics

When finance content creators rent out fancy cars and flex cash to seem richer than they really are in order to promote and sell their “get rich quick” courses.
Andrew Tate has mastered the field of larpenomics
Larpenomics by Rbois09 October 21, 2026
Word of the Day on October 21, 2026

Palmela Handerson 

Your hand that you masturbate with.
Girlfriend: What are you going to do for the next week while I'm on holiday?

Boyfriend: Have a visit from Palmela Handerson of course!
Word of the Day on October 20, 2026
x:"Girl your fit chewed today!"
Chewed by iod1o March 30, 2022
Word of the Day on October 19, 2026

Blue Movie 

A pornographic film.

The use of the word "blue" to refer to sexually explicit content was first recorded in Scotland in 1824. "Blue" meant "lewd" because prostitutes dressed in blue gowns.
I found your stash of blue movies under your bed.
Blue Movie by Shayde79 January 20, 2011
Word of the Day on October 18, 2026

fache-couture 

French slang, which translated, means "bull's fashion" but basically equates to "hyper trendy" or overly trendy. Used when a person wishes to express distaste at the latest fashion trend/fad, because it seems that everyone has a certain item of clothing or is wearing it. This term is most frequently heard in Paris but is slowly spreading to other parts of France.
1. That Burberry scarf is so fache-couture.
2. That purple American Apparel hoodie is so fache-couture.
fache-couture by bkgmh46x0x March 18, 2008
Word of the Day on October 17, 2026
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