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.
1) "Damn good at something" (shortened, with a crude intensifier) — someone you look up to, sometimes called a "named" figure in their field. 2) "Damn good-looking" (shortened).
"Character collapse," shortened — when a character in a show suddenly acts wildly out of character. Similar to "jakbung" (art-style collapse).
Read as "hi" — the Korean-pronunciation shorthand for the English greeting "Hi."
"Lunch menu recommendation" (or "dinner menu recommendation") — asking the group what to eat.
"Ilgan Best" (Ilbe), shortened — a far-right Korean internet forum.