Aliengender, or aliegender, is when one's interpretation of gender / their gender(s) feels as though it's from a nonhuman perspective. One may or may not adopt a gender or attempt to fit into a gender but it feels like it's in an "alien trying out foreign species’ gender" sort of way. Aliengenders can be xenine in nature, but do not have to be.
Similar terms include externusgender.
Aliengender was coined in 2014 by since-deactivated Tumblr user Genderghoul. It was submitted to and posted on Mogai-Archive, the first real archive of MOGAI terms, making it one of the original generation of MOGAI terms.
The flag was designed by an anonymous submitter to the archive blog Beyond-Mogai-Pride-Flags on June 18, 2018.