Surprisegender
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Surprisegender is a gender identity that can be identified by a male/female identity, but with a hidden "unknown gender" in the middle of the male/female crust. The gender in the middle changes daily, and on a random time every day, the gender shatters the outer shell of male/female and exits it, causing that unknown gender to become the person's gender identity for the day. The shell regenerates overnight during sleep.
The name is derived from Kinder Surprise Eggs, which have the outer chocolate shell, with a surprise toy hidden inside.