Mascgirlflux is when one identifies as female, but one's gender fluctuates heavily in intensity between feminine and masculine such that it affects one's presentation.
The term is derived from mascgirl - "masc" for masculine and "girl" for female. Flux refers to the fluctuation of how one feels the intensity of either gender.
The masculine equivalent is femboyflux.
History
The term was coined by Fandom user P0CKP1CK3T on June 27, 2021.
Flag
The flag was created by Fandom user P0CKP1CK3T. The dark pink in the middle represents the core gender, female. The layers of pink represent the levels of femininity, and the layers of blue represent the levels of masculinity.