Bigendershift is a gender in the bigender system in which one has two distinct genders that they are fluid between. One can be either gender, both, or a mix of the two. This gender can change abruptly or any other way.
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 black represents being distinct and separate. The purple represents a mix of the two genders. The white represents fluidity.