Smallgender is a gender in which one has about half a given gender, with the other half being agender or gendervoid. It is a subcategory of demigender, where part of one's gender is genderless. It can also refer to when one is demigender, genderflux, or genderfluid but does not know what gender they are/not knowing one's current gender.
Smallgender was created by julia2002thewikiuser as a gender counterpart to smallsexual and smallromantic. A day after that, the flag was made.
The meaning of the flag is: green/black=the agender part of smallgender, pink=representing feminine smallgender people, blue=representing masculine smallgender people