Genderfluid is a gender identity which refers to a gender which varies over time. A genderfluid person's identity may change constantly, so it's always best to ask what they are in that moment. For instance: You wake up a girl, then you suddenly feel like a boy. This may change dramatically, and rapidly, depends on the person. A common way of gender change is in response to different circumstances. Gender fluid people may also identify as multigender, non-binary, and/or transgender. Genderfluid people may feel more comfortable using gender neutral pronouns and have a androgynous gender expression.
Gender fluid people who feel that the strength of their gender(s) change(s) over time, or that they are sometimes agender, demigender, and a full gender may identify as genderflux.