Bidemigender or demibigender is a combination of bigender and demigender. In other words, it is when one identifies as two demigenders. Bidemigender individuals can be a combination of any two demigenders. For example, a bidemigender person could be a demiboy and a demigirl. One might be fluid between the two demigenders or experience them simultaneously.
It was separately coined on the LGBTA fandom wiki by Wikia user Trashwoof on December 20, 2020.