The Brief: "I did a thing" is a common phrase used by millennials before confessing or sharing something.

DEEP DIVE
The millennial catchphrase “I did a thing” means just that. It’s often used as a way to announce something that’s previously been kept secret. Its usage has been critiqued for being annoying and a form of bragging.
So i did a thing..
My parents told me that was ugly…
So here it is!! pic.twitter.com/lS2qfRG67N— Princess π¦ D-6 (@knj_dionysus) August 17, 2019
//Alright i did a thing
I need 150 retweets
Twitter do your thing pic.twitter.com/NqDTDVuDvM— Gim (@gimparody) August 23, 2019
So I did a thing….. pic.twitter.com/Qr62bmPQZw
— Luce (@allthewords3000) August 22, 2019