When you give somebody a colombian necktie but instead of letting them be, you tie their tongue to a noose and let it hold the person up.

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.