This word is mostly on the app called Snapchat people can use it on other apps and say send me a photo on snapchat to inform you to send a photo to them on Snapchat

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.