Originally from a polite gamer sign-off ("enjoy the game"), it got shortened over time and repurposed to mean "forget it" or "get lost" — often used to shut down an absurd item-trade offer or dismiss someone outright.
A suffix shortened from "-grade student" — used as "yu-ding" (kindergartner), "cho-ding" (elementary schooler), "jung-ding" (middle schooler), "go-ding" (high schooler), "dae-ding" (college student), "jik-ding" (office worker). As youth crime has risen, harsher, more contemptuous versions aimed at middle/high schoolers have become more common than the plain forms.
The meaning of emphasizing indigenous pro-North Korean forces as more vicious "Reds" than indigenous Japanese collaborators.
"No content," shortened — a post whose title is all there is, with nothing in the body.
"Good thing you're a weirdo too" (shortened) — said fondly to a friend who shares your quirks.
Rooted in Japanese, popularized as a coined phrase by Korean YouTuber/streamer BJ Bo Gyeom.
"Exiting a gallery," shortened — coined on DC Inside, originally for simply not using a board anymore, later extended to quitting a specific activity or something disappearing from it. Similar to "logging out"; the opposite is "ipgael" (joining/entering a gallery).