Doublegender is a gender identity describing an individual whose gender is so much of a specific gender that it is double that gender. "Double" may be used as a prefix for a given gender, such as doubleboy or doublegirl.
Differences to other terms
Doublegender is different to gender+ as it is double rather than something added on, different to gendergender as it can be specified, different to hypergender as it is a gender doubled instead of a higher percent of that gender, and different to walnutian/birchian as again it is a gender doubled instead of 101%-500% of a gender.
The term was coined by Discord user qb ⚣#8501 on September 20, 2022 and uploaded on Tumblr by a different user.
The doublegender flag was coined by the same Discord user.