Tidalgender is a gender that rises and falls in intensity every few hours, days, weeks, months, or even years. It can also refer to two genders that one fluctuates between that they consider to be high and low tide. It can be considered a specific term under the genderflux umbrella.
History
The term and its flag were coined by an unknown Tumblr user on June 1, 2017.[1]
Flag
The colors represent a wave of water, flowing in and out.