Slang, explained by the people who actually use it.

It is an abbreviation of "suddenly pops out."

Short for "default camera, no editing" — used to stress that a photo was taken with the phone's stock camera and not retouched.

"Mom's friend's son" — used for someone impossibly accomplished compared to you. The female form is "eomchindal" (mom's friend's daughter); there's also "bu-chinnam" (wife's friend's husband).

Shorthand for a crude insult meaning roughly "idiot."

Bit by bit, in tiny scraps — doing or collecting something in small, casual amounts, e.g. saving a little here and there.

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.

It is an abbreviation of "suddenly pops out."

From Japanese internet slang ("mental health" + -er) — someone, or a character type, who is emotionally unstable and clingy.