It means just Oof, but, Oof my dude. But, meme. It's not very popularized, but it can be used by a select group of intellectuals. So, make this a common phrase.

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.