The greens represent a cliche 'acidic' color, and the gradient to the dark green represents the erosion.
Acidigender is a sciencegender defined as "a gender that is a part of a fluid identity that, overtime, 'erodes' each gender the person fluctuates to over time, causing it to change, but does not affect the root fluid/fluctuating gender. Acidigender does not necessarily permanently destroy genders! Acidigender is to be paired with any fluctuating or fluid identity in all instances! Otherwise, it's just Caustigender."
Acidigender was coined on December 14, 2019 by tumblr user chernobylz (aka biohazard-mogai/dove-mogai/osdds). The flag was created at the same time.