Choicegender is a microlabel for when one is unsure of your gender identity or experience identity dysphoria, so one chooses a gender they like more. This is not designed to imply gender itself is a choice, simply that one can choose what to label it as.
For example, a genderfluid individual may call themself bigender or demigender because they dislike the genderfluid label. Or someone may dislike the connotations of "girl" so they call themself something else despite being comfortable being a girl.
Not to be confused with recugender.