Autogender is a gender experience that is deeply connected and personal to ones self, it is the gender counterpart to autosexual that can't be described with existing terms as of how deeply personal the experience is.
History
The term was coined by Tumblr user nandbaremyfavouriteletters on the 10th of January, 2016.
Etymology
The prefix comes from the Greek term 'auto', meaning 'self'.