Femboyflux is when you identify as a male, however your intensity fluctuates heavily from masculine to feminine and back in such a way it's affecting the person's representation.
The term derives from fem - for feminine, from boy - for male, and from flux - how one feels the intensity.
Flag
The dark blue in the middle represents the core gender, which is male. The layers of blue represent the level of masculinity, and the layers of pink represent the level of femininity.