An abbreviation that is widely used in texting and chat, and on Facebook and elsewhere on the internet, but what does KO mean in slang?
Most Common KO Meaning
KO stands for Knockout.
KO is used in boxing and martial arts when a legal strike renders an opponent unable to continue fighting. It is also used to describe someone as unconscious, fast asleep or very drunk.
You should see what happened to Zack after he was KO’d at the party.
Alternative KO Meaning
What Does KO Mean?