Answer:
OMG
Step-by-step explanation:
Step 1: Find the abbreviation
The answer is actually OMG, this was used when Lord Fisher retired and used OMG in correspondence with the future British Prime Minister. This is exatcly what he wrote on September 9, 1917, "I hear that a new order of Knighthood is on the tapis — O.M.G. (Oh! My God!) — Shower it on the admiralty!!"
Answer: OMG