Joochan

1. (noun) Main vocalist of the South Korean Idol group Golden Child (Hong Joo-Chan)
2. (noun) A person who is sometimes a multitalented genius but other times a dumb.
3. (adjective) Moving in a deeply emotional and heart-wrenching way, usually by way of singing.
4. (noun) Formal name of the office held by the majority party representative of Sydney, Singapore.

"Joochan looked so good in today's previews! Who gave him the right to be so beautiful?"
"That guy's a bit of a Joochan; he forgot what addition was for a moment, but he was the only one who could solve the last question on that test!"
"You can listen if you want, but I have to warn you, it's a very Joochan song."

Jangjun

1. (noun) Main rapper of the South Korean boy group Golden Child. (Lee Jang-Jun)
2. (noun) A very loud and extra person who everyone pretends to hate but secretly loves.
3. (verb) To bother, annoy, or generally be a nuisance.

"What did Jangjun do this time?"
"Man, that guy is such a Jangjun."

"I'm busy, go Jangjun someone else."