Billiogender is a multigender, that is a subset of mathgender, in which one feels as though they have, experience, or encompass a billion genders. It is similar to centilliogender, milliogender, kilogender, platilligender, trilligender, and zilliogender. It may also be considered a subset to pangender.
History
Billiogender was coined on July 31, 2018 by tumblr user arco-plurish.