A derivative term to emphasise joy, delight and ebullience between friends after a tremendous achievement has been bestowed. It could also be used to greet friends.

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.