Lee Ji-eun (born May 16, 1993), better known by her stage name IU, is a South Korean singer, songwriter and actress.
She signed with LOEN Entertainment in 2007 as a trainee and began her music career at the age of 15 with her debut album, Lost and Found. But it was through "Good Day", the lead single from her 2010 album Real, that she achieved national stardom.
"Good Day" spent five consecutive weeks at the top position of South Korea's Gaon Digital Chart and holds the record for spending the most number of weeks at No. 1 along with Psy's "Gangnam Style".
by jennie kim December 28, 2016
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IU stands for I'm useless as if you failed at something and you know it, or you got hurt in a stupid way. Or, just generally, you think you're useless.
"I just slipped in front of my crush.. iu,"
"I got my foot stuck under the table, iu"
And Also
"Wow i can't even tie my laces, iu"
by fatty spoon January 16, 2017
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A very hot hockey player who loves the game. He is the hottest guy on the team he will make the ice melt below his feet. He loves to fight and is a top scorer. Every one likes him and he is funny.
wow look at Ius he is hot!!
by Eddie-lover12//9127 December 06, 2010
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I.U.S (Involuntary uniform syndrome), either a one off occurance, or a constant accidental habit of wearing the same clothes as someone else.
Situation 1 - When explaining to a friend your dilemma

"I keep turning up places and making an IUS with people"

Situation 2 - When exclaiming to someone else in the same clothes

"Omg, we've got an IUS going on between us!"

Situation 3 - Two people walk in wearing exactly the same thing

"Wow, that's an amazing IUS!!"

Can also be A.U.S - Accidental Uniform Sydrome
by BayernBabe July 14, 2009
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Involuntary Uniform Sydrome - turning up anywhere wearing exactly the same clothes as someone else.
Person1: Saturday night was so bad - had an IUS moment with X

Person1: *points at two or more people wearing the same clothes* IUS!
by MuffinInAJar June 29, 2009
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It is a singular "we" instead of the plural "we".
"iu" are the best therefore it retains the singular of "I" and "YOU" are the best while meaning "WE" but emphasizing the singularity of the two individuals.

iu are the best on povdmm4...iu fight the nasty chavs that shit on the streets...I think iu have big ballz!
by Sam and Stu August 26, 2008
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