'OHKO' is the acronym for 'One Hit Knock Out' and has appeared in many video games over the generations. It is commonly used in games such as Pokemon, where it is abbreviated as 'one-hit KO'.
However, where does the term actually originate from? Is there an occurrence of the term in any game, before it was commonly used in Pokemon?
Google Trends shows that it was mentioned as early as 2004, but we cant ascertain the origin. Also, using search filters and searching on google includes inaccurate dates in the results.
Best Answer
Searching for this phrase turns up very little, and in terms of any kind of hard evidence of an "origin" is, as far as I can tell, non-existent.
The Pokemon Dictionary is the primary resource that comes up when searching for this specifically:
The only other source I could find that uses the phrase is Dark Souls 3, which uses it in the same manner.
The only other source I could find was the wiktionary, which only has a description, but of the three is the only one with a date:
Since this was derived from the concept of a "One Hit" defeat, there is a fandom collection of other tv shows, comics, animes, etc that use variations of the phrase, but this does not seem to be any kind of official source for the phrase (i.e. it is a fandom wiki), and the anagram "OHKO" is used fairly liberally throughout the page.
In terms of the origin of the phrase of "One-Hit Knock Out", this does orginate from boxing and fighting in real life - being derived from the "Sucker Punch"