Bigenderpair is a gender in the bigender system in which one has two genders, but how they experience both genders is fluid and one gender always outweighs the other. One can be both or a mix, but is never either gender separately.
An example of a bigenderpair individual would be someone who is fluid between man and non-binary. They may be both man and non-binary or a mix of the two, but is never either separately nor more non-binary than man.
The flag was created by the coiner in the coining post, on the same date. The blue represents the one of the genders that one is fluid between. The larger stripe represents the fact that gender always outweighs the other. The bluish and reddish purples represent a mix of the two. The black represents being both separately.