Who invented the expression omg?

The exact origin of "OMG" is unclear, but it's widely believed to have emerged in World War I, specifically in 1917.

Here's what we know:

* First recorded usage: The first documented use of "OMG" appears in a 1917 telegram from British Admiral John Arbuthnot Fisher to his friend Winston Churchill.

* Meaning: Fisher reportedly used "OMG" as an abbreviation for "Oh My God," which he apparently said frequently.

* Popularity: The expression gained popularity in the 1920s and 30s, particularly among military personnel and civilians who had experienced the horrors of the Great War.

While we can't definitively say who "invented" the expression, Admiral Fisher's use in 1917 is the earliest known documented instance, and it's widely credited with popularizing the acronym.