Scribblegender is a gender that feels complicated and is hard to describe with only one term. Scribblegender is under the multigender umbrella because scribblegender is an uneven mix of many different genders in a hard to define way. Scribblegender can also be used as a prefix for the dominating gender in the "gender soup" of scribblegender (e.g. scribblegirl, scribbleboy, scribblenonbinary.) Scribblegender can also be a xenogender where one's gender feels connected to a scribble in some way.
History
This term was coined by wiki user 12comets because xe wanted a singe term to describe xeir gender.