Selmutigender

 is a gender affected by having Selective Mutism.

Etymology
"Sel" presumably originates from "Selective", and "Muti" presumably originates from "Mutism", however the coiner never specified.

Definitions

 * selmutigender: a gender affected by having selective mutism! - Nico of Pupyzu, 2021

Flags
The Selmutigender colors were picked from the Anxiegender flag, and Lesbiflag's Selective Mutism pride flag