Confettigender is an aesthetigender that is related to confetti, party poppers, noise makers, or celebrations involving confetti in general. It can be used by non-binary and/or transgender people.
This term was originally coined on June 22, 2018 by an anonymous commenter on the Uncommongenders page of mogaipedia with the description "A gender associated with confetti. Can be modified for things like Starfettigender (star-shaped confetti) or even Confettimasc (confetti and masculine feelings)." There was no flag at the time.
It was later re-coined by Fandom / LGBTA+ wiki user CureCorpse to mean what it does now.
The Confettigender flag was designed by the same user who re-coined the term. The rainbow represents different coloured confetti pieces.