When a Girl/Chick/Woman catches her BF in the act with another female (or male/nonbinary human) on video and posts it publicly on IG, FB, Twitter, Snap, or other social media platform, then tags the chick in the post and switches it to, "private."

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.