K.O. 

short form for knock out
see wasted

I friggin K.O.ed that guy man he was wasted.

K.O. by wow December 1, 2003

K.O. 

K.O. is a abbreviation for Kill Opponent.
K.O. is commonly mistaken for Knock Out by naive pokemon game players.

Squirtle! Use Water Gun!

Squirtle has K.O.

K.O. by theonlyones February 27, 2011

K.O. 

Acronym for the "Super Uber Cool Online Awesomness game" Knight Online. Or can be used o describe someone that plays K.O. entirely too much.

Ex. 1 "I play K.O. all the time... and I have a girlfriend, doesnt that surprise you?"

Ex. 2 "K.O. plays K.O. all the time... and he has the hottest girlfriend on the planet... on the game atleast."

K.O. by -{Turkey}- Lt. Emerpoc October 17, 2006

K.O. 

There’s two meanings, one is ok backwards and the other is short for knock out.

John: did you know k.o. Is ok backwards?

Shantiya: I friggin K.O.ed that guy when we had a fight!

K.O. by St4rb4tzz June 6, 2022

K.O

Stands for "knock out" in reference to going to sleep or taking a long nap and mostly used as a verb.

"Yo, come thru to this party, mayne!"
"Nah niqqa, i'm bout to k.O"

K.O by PotHeadLuverGirl April 8, 2009

K-O 

1. When you knock someone out.

2. When u're knocked out

1. The K-O (knock-out) of Badr Hari was wonderfull!

2. Im totally K-O

K-O by desibabe July 4, 2009

K-O-Y rule 

k-o-y rule is a simple and effective method on popular applications such as Facebook chat or AIM to get annoying people to fuck off. Basically, all you do is respond "k", "o", and "y" after everything the annoying person says. They will realize that your one letter responses seem to show lack of interest in the subject at hand. Repeat if intended subject isn't fucking off

K-O-Y rule in action:
Example 1:
Jack: Hey Phillip!
Phillip: k
Jack: Wanna hang out?
Phillip: o
Jack: Well I didn't mean to be a bother...
Phillip: y
Jack: I'M LONELY OKAY?
Phillip: k

Example 2:
David: ...and then Julie started acting strange
Phillip: k
David: But I didn't finish.
Phillip: o
David: Will you stop with that??
Phillip: y

K-O-Y rule by kkpeezout November 25, 2011