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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
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plays alot of video games and loses points in computer classes and falls asleep alot
sungjoon is a reptile
Sungjoon by Soony February 4, 2010
A korean who is amazing at minecraft and fails at getting girls
"yo did you hear about ***** getting rejected by ******?"
"Ya I did he's such a sungjoon"
Sungjoon by BOBTHEPANDA October 23, 2018
A guy that you would not talk to since he will create a argument out of it and use it against you.
"Hey what do you think about this cup?"
"The cup's plain design is just so useless."
"Wait what?"
- Sungjoon
Sungjoon by abojds November 23, 2021