Flirting with or hitting on your good friend's very serious girlfriend. Named after "Koon" of youtube fame. Kooning is often made possible when the boyfriend is away and the girlfriend shows pity for the kooning boy which is misinterpretted by the desperate despicable kooner as affection. Kooning is not cheating because the girlfriend is very pleased with her current boyfriend which just makes kooning all the more despicable.
"Did you see Alex kooning last night? If Nick knew he would beat the shit out of him!"

"How can you respect anyone who koons as much as he does? Doesn't he realize he doesn't have a chance?"
by Bob321 March 17, 2007
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inserting objects into your peehole.
Dude, Daniel's been kooning with a torque wrench. His peehole's gotta be super ragged out by now.
by Bahn burner August 25, 2010
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A person that is incredibly dull and annoys you any way possible. AKA= Mark Wong
Man....that koon koon always follows us around everywhere.
by Jason Lau March 15, 2005
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Adj: a black person who acts white and only hangs out with white people.
Tyrone only hangs out with white boys he's such a koon
by Uncle ruckus 124 August 28, 2017
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A black person who is anti-black and acts against black people.
Those black Trump supporters are Koons.
by Xaviauna June 30, 2021
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Means ASS in Persian. Widely being used.
BORO KOONETO BESHOOR! Go wash your ASS you dingdong!
KOONESH GOHI BOOD! He was a SHIT-ASS!
by steel alone November 16, 2006
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Used as a disparaging term for a Black person or it can be used as another way to refer to a person of African descent
Damn son, thats a fine ass koon right there!
You cheap ass koon!
by Gaurav Hiranandani January 09, 2006
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