Mixflux is where someone is a mix of everything. Someday's they may like male more, and otherdays, female. Nothing having to do with gender or sexuality, puts them back. They generally like everyone. Sometimes they don't change their sexuality, but their gender instead. This person is not polysexual, bisexual or pansexual. They may be genderfluid, but don't want to identify by more than two things. They tend to hate labels, but feel the need to put a label to themselves, because they dont quite understand themslves.
If they ever label themselves as say "bisexual", they will soon be rethinking. Label's and pronouns, don't generally work with this person. Sometime's he, sometimes she, sometimes they.
Instead of saying you are "______ and genderfluid", you could say you are mixflux.