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Used in a way to respond to shock, something that caught you by surprise.
Also a short version of the spanish term hijo de la chingada.

Pronounced: e-lo
40yr Old Virgin: Who are you talking to?
Superman: I'm talking to Bruce Lee's daughter, don't be jealous dude, I'm going over later and we're making babies.
(On the phone) Lee's Daughter: Illoo! Don't call me that.
(Overheard) Batman: Wow Superman, WOW.
Illoo by Andoh November 7, 2009
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a very hot asian that can rap
Person 1: Damn, that asian can rap
Person 2: Oh he's cute too
Person 3: That's just Ilhoon
ilhoon by Kita Bear June 23, 2014
The sexy main rapper from Kpop group Btob who deserves the world.
Person 1: Who's the sexy joker guy from movie mv?
Person 2: That's Ilhoon.
Ilhoon by Hutazone March 1, 2021
league of legends champion with alot of tentacles and i mean alot
like alot
just quit the game
theres illaoi im quitting
When someone says ILU (I love you) in real life it sounds like iloo.
Iloo Rose!
Iloo2 Ross!
ILOO by McTodger May 7, 2008

illogoracy 

unfamiliarity with logical concepts and methods or inability to use logic.
illogoracy is an affliction that educators have yet to tackle effectively. innumeracy illiteracy myologia
illogoracy by Zembayyeh August 14, 2010
The illusion of being highly intelligent, often displayed in a classroom environment by continuing to speak out on a subject in which one has no actual knowledge.
Due to being so Illougent, Tyrone continued talking to the professor about advanced psychology as though an 18 year old might know anything on the subject other then from watching the Doctor Phil show on TV. His Illougence was preventing the class lessons from proceeding.
ILLOUGENT by Commander Meatpuppet January 31, 2009