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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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Lee Seungjoon 

the phattest ass in ONF, heck phattest in the whole kpop industry even
“Lee Seungjoon ass flat af!” - sjass anti

Lee Seungjoon ass is just too much for them to handle
Lee Seungjoon by sjasscult November 21, 2020

seungjoo 

that guy over there is such a seungjoo!!
seungjoo by user204944728 November 21, 2021

seungjoo 

A slang in korea that points towards a thief that steals watches and denies that they have stolen it until the end!
Oh that seungjoo just stole my watch but he keeps denying!
seungjoo by CrackerandJam November 23, 2021

Lee Seungjoon 

the fattest ass in ONF, heck even the whole kpop industry
“Lee Seungjoon doesn’t have ass” - sjass anti

Lee Seungjoon ass is too much for them to handle
Lee Seungjoon by sjasscult November 21, 2020