Used by young people in the UK to describe the action of workers of the Royal Mail postage service of the UK being lazy and greedy. This term refers to the expression below, showing how little people like how bad their postage services are.

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.