Not only is the expression O.M.G. over 100 years old, but it's one Winston Churchill knew.
In a letter dated 9/9/17 Lord Fisher wrote to the Right Hon. Winston Churchill: "I hear a new order of Knighthood is on the tapis — O.M.G! (Oh! My God!). Shower it on the Admiralty!"
Just goes to show — sometimes language that sounds modern really, like, isn't.
