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"Sung-Joon" is a slang term for someone who purposefully irritates others whilst acting oblivious to his/her actions.
Person X posts a photoshopped picture of Y to irritate him/her

Y: "why did you do that?!"
X: "ha...what are you talking about?"
Y:"You know what I mean!...your such a Sung-Joon"

Another example:

Person X falsely claims to have beaten up person Y in a sad attempt to gain clout from his/her peers.

Y: "Why are you telling people that you beat me up?"
X: (Giggling)"because I did"
Y: "What are you on about? Your such an SJ!"
Sung-Joon by O-Poggers August 8, 2020

i miss joon 

a phrase often used by namjoon-biased fans when he hasn’t posted on twitter in 2+ days
@bts_twt: *inactive*

army: i miss joon.
i miss joon by 2seokrise April 7, 2019

Lee Joon 

Lee Joon, real name Lee Chansung, is one of the most adorable, craziest, sexiest human beings on earth. He is known for:

"You shouldn't do that" in the movie: "Ninja Assassin".

Lee Joon is a famous korean singer in a boy band called MBLAQ standing for Music Boys In Live Quality. Lee Joon has killer abs. Really. They kill girls with just one look. People say he reminds them of pikachu. He does. He's the cutest pikachu ever. He's a ladykiller as well. Overall he's one fine ass motherfucker. Joonie has an amazing smile, body, laugh, face, existence, and personality. He wishes to be like Bi Rain oppa. He can only wish and worship the monument he probably has of him in his closet. When you get to know him, I promise you won't be the only one wishing you could be in bed with him. He's probably an animal in bed. Hnnnnnnng~
Girl A: HEY! Did you see Lee Joon's abs on google?!
Girl b: OH MAH GAWD. HOW COULD I NOT HAVE? THOSE ABS. DEAR LAWD, SOMEONE HELP ME. MAH OVARIES EXPLODED. THEY WERE FINE AS SHOOOOOOOT~
Girl A: OH EM GEE, I KNOW RIGHT? BBY LET ME LOVE YOU DOOOWOOOOWN. DURS SO MANY WAYS TO LOVE YOUUU~
Girl B: HE GOT ME LIKE OH MAH GAWD I'M SO IN LOVE, I'VE FOUND YOU FINALLY. YOU MAKE ME WANT TO SAY

Girl A & B: OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OH OHHHH MYYYY GAWWWDDDDD~
Joon is a person who is always thinking, always dealing with fucked up shit, shit that no one deserves to go through. He keeps to himself, very hard to read and understand, he deals with more things than people expect. People think he has no emotions, but deep down he’s filled with so many. He’s one of the best people you could ever be close with, he will give so much love & loyalty and share so much of his wisdom. He is one of the smartest people in the world but I don’t think he releazies his great potential. He was meant to do things that are out of this world, but he doubts himself so much feeling he is unworthy of all good. Joon has been one of the biggest blessings in my life. He is special, different, and of course very good looking as well. Joon is a person I will love until the end of time.
Wow you're close with Joon? lucky you!
Joon by Livelovelaughlollollol September 19, 2019

Doo Joon 

Doo Joon, the BEASTLY leader of Korean group B2ST/BEAST a.k.a my loving hubby <3
OMG! Doo Joon is so hot <3
Doo Joon by beeestdj July 25, 2011
Joon means Dear in the Iranian/persian farsi language. It is most fequently used in terms of affection and attatched to ones name.
Joon can also mean hottie.
In a sense it's used like the word babe or baby.
Jeanne-joon how are you today sweatheart?

Damn that joon has a beautiful ass!

Ohh.. joon...you are so good.
joon by J. Tala April 15, 2006
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Instead of doing my homework, I decided to piddlefart around for two hours.
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"Hey, do you know that girl Sally?"

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"Wow, what a Bunhead."

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