Refers to an individual's character that makes them appear bland and boring.
Derivation: Maybe originated from the idea of cereal being an everyday item thus making it uninteresting.

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.