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It doesn't only mean Knock Out. It also means Kilobyte=Ko.
Ko is very familiar. A large file is 12 737 Ko.
Ko is Coca Cola's symbol on the stock market. Ko is the name of many companies including Ko and Co (Ko and Company).
KO are some people's initials. KO is a good blog from Pakistan. Ko is now very much open to interpretations but the first ones are Knock Out (KO) as in boxing or as in a gorgeous person and Kilobyte (Ko) as in 1000 Ko will make 1 Mo. When you're sending a 12 737 Ko file, you're in trouble because servers will stop you, it's too heavy. Please add on to the meaning of Ko.

Imagine someone's initials being PS (Patricia Smith) or NB (Norman Brown) or CC (Carmen Constanza)or C/O:care of (Claude Otterburg). I believe our initials define us in a way...
by Katherine Ouimet April 22, 2006
1)K.O. as in "knocked Out" can be used in life when someone is unconcious and also appears in fight games when there is a victor and the loser is K.O.

2)the dyslexic way of saying OK.
(I have a dyslexic friend and this is her joke, its not meant to be hurtful or nasty in any way)
PersonA: hey PersonB, u want to go to the movies?
PersonB: ko

PersonA: Im going to knock u out
PersonB: ... *is knocked out*
PersonC: K.O.!
by ThatGirl January 13, 2005
short form for knock out
see wasted
I friggin K.O.ed that guy man he was wasted.
by wow December 01, 2003
totally intoxicated
unable to stand / speak
short for "knocked out"
that boy drank too much - he's k.o.
by will December 11, 2003
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"
by PotHeadLuverGirl April 08, 2009

1. a knockout

2. to knock someone out
If he manages to KO him every time he'll be braindead pretty soon.
by Light Joker March 23, 2007
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.
by theonlyones February 10, 2011
A Canadian Musician with most of his songs about smoking weed. Give him a listen.
Hey man did you hear that new KO song about him selling crack when he was younger?
by lolidkwtnm July 01, 2011