Historical usage of OMG (Admiral "Jacky" Fisher wrote like a texter long before SMS)

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Admiral Fisher (via royalnavy.mod.uk)

In a quite lovely bit of sleuthing, the Oxford English Dictionary has discovered a use of'OMG' from 1917 [1]. It comes in a letter by British Admiral John 'Jacky' Fisher, who wrote that:

I hear that a new order of Knighthood is on the tapis—O.M.G. (Oh! My God!)—Shower it on the Admiralty!