Tridemigender is a combination of trigender and demigender. In other words, it is when one identifies as three demigenders. Tridemigender people can be a combination of any three demigenders. For example, a tridemigender person could be a demicat (catgender), a demiboy, and a demipup (pupgender).
It was seperately coined on the LGBTA fandom wiki by Wikia user Trashwoof on December 20, 2020.
The Tridemigender flag was designed by an anonymous Wikia FANDOM user. The flag is a combination of the trigender and demigender flags.