It's one of those acronyms many people associate with annoying teen-speak, but a letter written to Winston Churchill in 1917 has revealed that OMG was actually being used last century.
British admiral John Arbuthnot Fisher used OMG (oh my God) in the letter: "I hear that a new order of Knighthood is on the tapis - O.M.G (Oh! My God!)- Shower it on the Admiralty!!"
OMG, which has been added to the Oxford English Dictionary, is usually associated with young people.
"It's a far cry from the upper-class world of Lord Fisher who was one of the most celebrated officers in the history of the Royal Navy," Britain's Daily Mail reported.
"Lord Fisher began his career during the Crimean War and ended it during the First World War.
"He is widely credited for materially preparing the fleet for war, introducing the world's first all-big-gun battleship Dreadnought, however he resigned as First Sea Lord in 1915 after falling out with the-then First Lord Winston Churchill over the commitment to the Dardanelles expedition."