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 by Tumblr user arigenderdefender (now autisticakemihomura) on July 16, 2014.[1][2][3]
Flag
The flag was created by DeviantArt user Technologyfurs on June 12, 2018.[4] 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).