Gravigender

Gravigender or Gravgender is a xenogender that is extremely intense and strong. One's gender may also feel "heavy" but that is not required.

History
Gravigender was coined on July 17, 2016 by tumblr user eaglestrike (pym-maximoff as of 2019).

Flags
The flags were created on or before August 2, 2016 by kaktusyolo13. They have no confirmed meaning.

Resources
http://archive.is/fnGmK#selection-139.14-139.63