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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

park seo-joon 

Park Seo-Joon is a very charming korean man with the ability to win over any girl he wants. He is the definition of dreamy. The amount of handsomeness he holds is ASTRONOMICAL!
Girl 1 : Do you know Park Seo-Joon?

Girl 2 : Obviously! Who wouldn’t know the famous heartthrob???

smelly joon 

smelly joon is someone you meet on the bus that like you but you don't like him becuase he smells like some of these things (bucket head, stinky feet, original trout fish, and poo from world of poo). This cause him to sit in your seat but then you verbally abuse him and he goes running home to his mummy's boy (someone who likes him) saying or screaming "UWUWUWUUWU."
eeww that guy who sit with us is a smelly joon!
ugh what is that disgusting smell, it probably is a smelly joon
smelly joon by Giahwgfa 2 May 3, 2019

joonsexual

When someone is only attracted to Kim Namjoon from BTS.
Friend: Hey that guy is super cute you should go get his number!
Me: Sorry but no. Im Joonsexual.

Friend: You’re what?
Me: I’m Joonsexual
joonsexual by stanbts<3 September 28, 2020

joonsfavexpensivegirl 

joonsfavexpensivegirl is the hottest Kim namjoon fan in existence of all namjoon fans, and everyone shall bow down to her of face penalty.

joonsfavexpensivegirl 

19 yr old Gojo cosplayer who posts concerning videos at night, she’s also a Dionysus anti.
POV: You turn on Dionysus in front of me

“Cut this **** the **** off 😡” - Joonsfavexpensivegirl
More from Urban Dictionary
A US deep south term for an alligator. Usually used in the Cajun dialect.
Take the big pirogue, I saw a huge swamp dog out there earlier.
swamp dog by Crystal Ambrose May 22, 2006
Word of the Day on October 12, 2026

Throat Sweats 

The feeling and build up in your mouth/throat of saliva that sometimes accompanies nausea.
Oh man those burritos gave me the throat sweats, I hope I don’t have food poisoning.
Throat Sweats by TacoFings420 April 23, 2024
Word of the Day on October 11, 2026
Being ignored by someone when making a statement or asking a question. Also known as blanked and turfed.
Person 1: Did u watch ** last nite?
Person 2:......
Person 3: O no u got aired!
aired by Pietro February 9, 2005
Word of the Day on October 10, 2026

piddlefart

Instead of doing my homework, I decided to piddlefart around for two hours.
piddlefart by Rene April 25, 2005
Word of the Day on October 9, 2026
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026
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