Flustagender is when one will identify with a fluid gender, but overtime their gender will seem more static and so they may identify with a static gender, and then a while after that it will seem more fluid again so they may identify as the same fluid gender as before or with another fluid gender, and so on.
History
Flustagender was coined by an anonymous user from another website who has asked to keep their information private.
The term flustagender comes from the words fluid and static.