The word spudmunkin has no origination nor definition it is up to the user to define in their minds what it means. The word allows one to use their imagination when they have become so lost in the grown up world.

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.