A high so severe that functioning at 25% seems out of reach. It is a word to describe your friend sitting in the corner with his eyes rolled in the back of his head blabbering and laughing about nothing for hours.

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.