A nickname given to lead singer of Panic! At the dick, Brendon Urie, only true P!ATD fans would understand, and if you arnt a fan but know what it means, then you probably have a P!ATD obsessed friend.

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.