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A game genre that originated in April 2015. It all started with Agar.io, a game where you have to eat like a pig and try to become the biggest player in the server. Not long after, Slither.io was released, followed by Wings.io, Diep.io, Splix.io, and many more.
Due to how simple they are to make, there are hundreds of .io games out there.
I remember when the first .io game was released.

Yeah...and the creator was...19 at the time? He probably thought his game would fall off the face of the earth...but instead he created an entire genre!
.io by Ubeenbamboozledson July 28, 2020
Related Words
Ion Iowa iono IONA io ioi Ioan Iota ioana Iowa City
She´s very beautiful and kind. Has one of the most uniques names in the whole world, that makes of her a very special girl. She has the name of the most beautiful moon of the planet jupiter and also the name of one the maids of Hera, in the greek mythology. Ío, you are cool, XOXO.
Look at Ío, she´s called like a moon.
I would love to call my daughter Ío.
ío by besosdetuperezosa November 22, 2021
The top-level domain that used to be a fad to use for indie game projects with 1980s graphics, but nowadays lets you recognize a toxic Silion Valley start-up with the containerized framework crypto AI offerings to solve a problem, that wouldn’t be there without people like them, with more of the same.

You know… the ones with the huge stock photos and utterly useless text blurbs, that look like that of an asexual pickup artist peddling courses. The one seemingly run by 3rd-wave-coffee-sipping iDrones in skinny red plaid dungarees with black suspenders, black 50s glasses and side-combed undercut Hitler Youth / generic-diverse-curly hairstyles running the equivalent of jsLinux as their primary OS. The child of Juicero and a Musk project, not doing hardware, not software, but maybe something cobbled together from existing big projects that a skilled coder could put together himself in an evening, but it somehow presented as the greatest invention to ever save the world. Making Pied Piper look like the old and sane generation.

Not a single barefoot greybeard hacker who has worked on bare metal or Unix boxen in sight. They’re CoC-blocked.
A: Hey, have you heard of that great new thing, doteyeohh.io?
They.io made this amazing new invention that will change the world.io! The iMSmart.io!

B: They invented the … browser?

A: NO!! The text editor dot IO! It’s a platform! For frameworks! In a container! Using the new Crust language! See? You can install any scab you like! Let me just download this 128x128 pixel art animation! … hold on this is only terabit 6G… OK, … See?

B: It takes 12GB to run… a disguised Chrome browser in a disguised VM? … Why are my fans spinning up?

A: That’s just the AI gathering your neural data for Google Telemetry. It will make writing text super-easy! You don’t even *have* to make life choices anymore! Who doesn’t hate being an actual individual, right?

B: Nice OS you got there. If only it had a better text editor…
.io by Evi1M4chine December 4, 2022

io saturnalia 

The celebrative phrase used for the ancient Roman holiday of Saturnalia, celebrated in December. An ancient Roman version of "Merry Christmas." Pronounced like "yo Saturnalia."
Student: Io Saturnalia!
Teacher: Shoot, I forgot to bring candy for the class.
io saturnalia by cirria November 28, 2006

.io games 

Small web browser games that a lot of people play.
.io games by QuestCLicker December 14, 2016

.io games 

.io games are multiplayer games with simple mechanics, but hard to master. All .io games are played on the web, and some are available on mobile platforms.
Hey want to go play some .io games? Ok, lets get on discord then and go play some Krunker.io
.io games by GamerofIO February 16, 2019