Swaggender, or swagender, is a xenogender/mutogender in which they feel a different gender than usual when one feels cool or when a person feels proud of themselves.
A similar term is prigender, which is specifically for pride in ones romantic and sexual orientations, relationship identity, and gender identities.
History
The terms appears to have been coined by Fandom user AlexxxxGRRR December 28th, 2020.
Flag
The flag appears to have been coined by Fandom user AlexxxxGRRR December 28th, 2020. It has no confirmed meaning.