Mercurygender

Mercurygender is a fluid gender that frequently fades but comes back quickly, reminiscent of the orbit of the planet Mercury, which only lasts 88 days.

Etymology
A combination of "mercury" and "gender".

Definitions

 * Mercurygender: A gender that leaves yet comes back quickly. This is reminiscent of the planet Mercury’s orbit, which only lasts for 88 days. -Pride-Flags, 2015

History
The first documented use of mercurygender was by DeviantArt user Pride-Flags on September 7, 2015, on an upload of the mercurygender flag. The description of the upload credits account mod Hermy with designing the flag, and states that the design is meant to visually resemble the planet mercury.