1.) An avatar in the game called 'Roblox' who was famed for his overuse of the word 'nob' on the site's Forum.

2.) The starting word of many foods that include cooked duck. Some include 'ducksen stuffing,' 'ducksen chicken,' or 'ducksen flan.'

Marginalized Orientations, Gender identities, And Intersex. it’s meant to be an all inclusive umbrella term for asexuals, homosexuals, multisexuals, trans people, and intersex people. Alternative to LGBTQIAP+
Alternative to MOGII, easier to pronounce.

Ducksen is a word of insult for a way to say something mean to somebody in such a situation like school; without getting in trouble because most teachers or adminstrators don't know what it means.
Ducksen means:
D-Dumb
U-Ugly
C-cock-sucking
K-Kinky
S-Selfish
E-eww
N-Nobody

It seems immature; but its one of the ways to insult and get away with it.