The old recugender flag.
Recugender or refusgender[1] is a term where one identifies with their assigned gender at birth, but "refuses to identify as cisgender". Related terms are recugirl or recuboy. "Recu" comes from the Latin word recuso, which means "to refuse"
Controversy with the first term
The first term is commonly seen as an excuse for cisgender people to try and be included into the transgender community, or is used by cisgender people who think cisgender is an insult or dislike being called cisgender.
Reclaimed Definition
An alternate, reclaimed definition was created by Tumblr user ashix0trender0juice on Janurary 6, 2021.[2] The new definition is to identify with one's birth gender, but refusing to be called cisgender, because one is transgender and/or non-binary in a way where one identifies with one's AGAB in some way, due to complexity in one's gender. Examples of this can include: AMAB demiboys, genderfluid people who sometimes are their AGAB or have a gender relating to their AGAB. This term can also be useful for plural and intersex people.
The original definition is still the most widely known.