Bigendermix is a fluid gender in the bigender system which one has two genders, but rather than them being distinctly separate, they are mixed or intertwined and the ratios are fluid. This gender can change to different ratios abruptly or fluctuate between the two.
An example of a bigendermix individual would be someone who is fluid between man and non-binary. The individual will always be somewhere in between man and non-binary, but the ratios would change. They may be more man one day, more non-binary the next, and then equal the next.
The flag was created by the coiner in the coining post, on the same date. The blue and red represent the different genders that one is fluid between. The small stripes for these two colors represent the fact one is never solely either of these genders. The colors in between represent a mix of the two.