YTA
What does YTA stand for on Reddit and social media?
You're the a**hole
Example
"AITA for waiting three months to cash my brother's check and accidentally overdrawing his account?"
"Yes, YTA."
"Yes, YTA."

An example YTA response from Twitter
Related Slang
Usage
Last Updated: February 18, 2021
On Reddit and other social media platforms, YTA stands for "you're the a**hole." Posters use this slightly-crass acronym to assert that another poster is a big ol' jerk.
Most often, YTA is used in response to "am I the a**hole," or AITA, posts. In Reddit's popular r/AmItheA**hole subreddit, posters ask questions like "AITA for cutting my mom out of my life?" or "AITA for not wanting to run with my GF?" If the OP was indeed the a**hole, commenters often start their responses with YTA.
While YTA is most popular on Reddit, you may see it used on other social media platforms, including Twitter, TikTok, and Instagram. Often, when people use YTA on these platforms, they are responding to a question that has been poached from the r/AmItheA**hole subreddit.