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Kill(ed) on sight. Used for a person/group of persons who are banned from an area. If this ban is broken, they will be killed on sight.
U're on KOS. If u ever come here again u will be killed on sight.
K O S by Mau August 2, 2005
Kill On Sight. From games such as World of Warcraft, etc. Means basically marked for death just by showing your face.
Damn, they KOS'd me!
Look out, I think we're KOS!
K.O.S. by offkilter March 23, 2005

Ko Seanie 

An individual who has a tendency to suddenly but not unexpectedly, run off into to sunset after consuming some bottled beer. Subject may become erratic and become concerned with your political views.
X: Wheres he gone?

Y: He's pulling a Ko Seanie...

X: Tsss
Ko Seanie by Brian Cowen March 7, 2011

K.O.S. Insurance Company 

Stands for "Kindness Of Strangers". Humorous term for just the "old as the hills" practice of merely soliciting the assistance of nearby fellow humans if you have an emergency, rather than paying big bucks for an emergency-assistance plan from an insurance provider. The Amish/Mennonite people are widely known for this "deep sense of community" way of doing things.
I try to always keep my vehicle in good shape and carry all the necessary tools/supplies that I'd likely need in my trunk, and so I don't bother subscribing to AAA's roadside-assistance plan; so far, the K.O.S. Insurance Company has always seen me through with the few emergencies that I've ever encountered while tootling around the countryside. And in fact, usually I am the one who has been the "assister" --- way more often than not, it is I who have come upon other motorists who have broken down for some reason (i.e, flat tire, empty tank, dead battery, overheated engine, etc.), and so I am often able to use my own equipment to get them "up and running again", "patch them up" enough to "limp back home" under their own steam, or tow their jalopy to the nearest service-garage.
gaming term meaning Kill On Sight. Basically a wanted add if directed at a single player. Or it can be used to describe another team you would rather kill instead of another.
Dude, he's K.O.S.
ignore green blues are k.o.s

Ko Shinwon 

An icon for the lgbt+ community. The leader of the gays.
Can't sit properly in chairs. That should explain a lot.

Is in love with every Pentagon member.
"You're bisexual? So you must know Pentagon's Ko Shinwon"
Ko Shinwon by sohwaat April 5, 2022