What it means
To ratio someone or get ratioed is when a reply, quote tweet, or the comment pile-on pulls way more likes than the original post, basically the timeline's scoreboard saying the crowd isn't with you. It's a very public online L.
Usage examples
"That hot take got absolutely ratioed in the comments."
"Post something that bad and you will get ratioed in minutes."
"He tried to dunk on everybody and got ratioed before lunch."
"Delete that tweet, mate, you're getting ratioed into the floor."
Where it comes from
It comes from the plain old word ratio and took off on Twitter, where people started judging posts by the balance between likes, replies, and quote tweets. If the response to your post gets way more support than the post itself, you've been ratioed in full public view.