International Decode Day

International Decode Day is on March 11th, according to the Geometry Dash forums. Started by Geometry Dash player Noice, it is the day where the holy Geometry Dash level, "Decode" by Rek3dge is played annually across the entire Geometry Dash community. Typically, videos of the level will be uploaded to YouTube on this day from various dashers on the platform, by both popular and lesser known figures.

Gamer: Hey bro what day is it today?
Dasher: March 11th, do you know what that means?
Gamer: No, what does it mean?
Dasher: IT'S INTERNATIONAL DECODE DAY

International Decode Day by AdashioX October 23, 2019

Decahexatris

The highest combo you can get in the latest installment of the Tetris franchise, Tetris Effect. A Decahexatris is achieved by accumulating a 16 row combo when the mode Zone is active (which is activated when the player fills up the meter by clearing lines, which then puts the game in a state where the blocks are frozen in place until the player decides to move them). Once the Zone meter goes down, it allows players to essentially clear 16 rows at once, beating the past highest row combo you could get which was 4.

Friend: Dude, I think Trey is going to get a Decahexatris

Me: No way, that's nuts!

Decahexatris by Pseudo-ephedrine June 29, 2018

Has anyone really been far even as decided to use even go want to do look more like? 

A reply to a thread on 4chan's /v/ board about the Wii game The Conduit. Due to it's complete and utter lack of coherence, and therefore high comedic potential, /v/irgins jumped on it and began to spread it across the rest of 4chan and Youtube. Extensive research has ended with this meaning (from knowyourmeme.com):

Original:

“Has anyone really been far even as decided to use even go want to do look more like?

Rephrased:

“Has anyone really decided as to even go that far in wanting to do to look more like so?”

Deciphered:

“Has any video game company really taken such measure to make a game so realistic?"

Has anyone really been far even as decided to use even go want to do look more like? by lawngiant July 13, 2009

Deceder 

This word is derived from a misspelling of "Deceiver". It has risen in popularity with the rise and prominence of Facebook's Marketplace.

A Deceder is someone who constantly lowballs people but also lies about market price.

Usually a noun, it can also occasionally be used as an adjective.

I knew my comic was worth $100, and this Deceder guy said he'd give me 70% of value, but then when we met up in person he claimed it was only worth $80, and tried to pay me $56. Just a huge waste of time.

That guy was such a Deceder, you'd think he was from Austin TX, home of the lowball king, and "Following for Price Drop."

Deceder by JoshUABattle July 27, 2021

The Decider 

The Decider is the supreme ultimate decision maker for the world.

President George W Bush: "I'm the decider, and I decide what's best, and what's best is for Don Rumsfeld to remain as the secretary of defense."

The Decider by R. Alexis May 6, 2006

Decahexatris

The ultimate play in a game of tetris-effect, clearing 16 lines of tetris blocks in a succession while "zone" is active.

"Dude did you see decahexatris?!"

Decahexatris by Marksman762 June 28, 2018

executive decider 

The guy at the top. Someone upstairs whose paid the big bucks to make the big decisions (;and, maybe not much of anything else get done by this person).

President Bush declared that HE is the Decider.

The magic eight-ball often stands-in as EXECUTIVE DECIDER.

When the governor refused the Stay of Execution, he de facto became the EXECUTIVE DECIDER in that convict's life.

executive decider by Chengo Bolemongo October 6, 2006