The word "Wheao" is used in the northern parts of Germany. Most often you'll see the BillyBoysons use it. The words meaning is undefined it's more of a filler and can be used at any time.

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.