When you fuck up something that's hard to fuck 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.

Typically associated anytime the words "Why the fuck would he do that?" could be used.

"accidentally" touching someone's boob while in conversation with them.