Mesogender is a gender that is something between male and female but not distinct from both.[1][2] This can include bigender, centrigender, cogender, and any other similar genders.
History
Mesogender was coined by Tumblr user malcubus on July 14th, 2019.
=Flag
The mesogender flag was coined by Tumblr user gendies 'n' more on January 10th, 2019. It has no confirmed meaning.