Collsumagender is a subset of collapsargender. It is a gender that is related to a supermassive black hole; the largest type of black hole, which is found at the center of galaxies. Collsumagender has a strong gravitational pull, like a black hole, and tends to pull other gender identities into it and compress them before spitting them out in a compressed form.
Collsumagender can also be used as a prefix for other genders, for example collsumaboy, collsumagirl, collsumaflux, etc...
Collsumagender was coined on April 22, 2019 by Tumblr user mogaiformycharacters.
The Collsumagender flag was made on January 2, 2021 by Fandom user Starfruit110. The stripes have no meaning at this moment, and the black gradient in the center is meant to symbolize black holes.