Fixigender is a neurogender that was coined twice with two different meanings. The first definition is a gender identity where one feels like their gender is based in a hyperfixation that they have, or had at one point. The hyperfixation could be added to the front (for example, Mossfixigender), or, the gender suffix could be changed (such as fixiboy or fixigirl). The second definition of the label is a fluid gender experienced by those with ADHD/ASD which can fluctuate or intensify with a hyperfixation. It may feel like it fades without a hyperfixation, or feel that the gender depends on the hyperfixation.
This can be considered a subset to ADHDgender or autigender, but it does not have to be.