Acidusgender

 is a gastrogender that feels as if it has spoiled and gone bad, carrying a negative taste.

Etymology
Although etymology was not specified in the original coining post, it is assumed that the term comes from the root word acidus, meaning sour in Latin and relating to the idea of a gender that has "gone sour". It is suffixed with the popular gender suffix -gender.

Definitions

 * a gender that feels as if it has gone sour, and out of poor taste, can be used as acidusboy, girl, etc - mason, 2018

History
Acidusgender was coined on November 9th, 2018 by mason, who submitted the term to beyond-mogai-pride-flags along with several other gastrogenders. The flag was designed and posted by the same user soon after on January 30th, 2019.