Ergender is a gender that is a little bit boy, a little bit girl, a little bit non-binary, and the rest of one's gender is something else.
History
Ergender was coined on or before June 12, 2018 by Tumblr user arigenderdefender.
= Flag=
The flag was coined on or before June 12, 2018 by DeviantArt user Technologyfurs. Pinkish represents femaleness, blue represents maleness, neon blue represents non-binary, and dark blue represents a primordial soup of gender (the something else one may experience).
Resources
https://www.deviantart.com/pride-flags/art/Ergender-752983349