From mere surprise to major shock, OMG is a common-enough expression made by many that it seems to be a standard way of expressing emotion, such as “ouch”, “oh dear” etc. The interesting thing is that OMG is more sparingly used by Christians; and agnostics tend to work harder of all to refrain that expression, instead, they might use “gosh”. Yes, there will be many variants in different places and communities.

When we ernestly seek help from God, it’s when we are out of our depth (or capacity) to face what is about to come, and more of the “bad” and “shocking” as time passes, that we are calling out to call – to express our dire situation, we cannot cope, we have no means to deal with what is to come. We also acknowledge that God is in control. There is a sense that we are praying for what appears to be coming soon, God could better it, or stop it.
One of the most extreme forms of emotional turmoil is the passing away of a dearly loved one. We might know that due to their situation, health, or for some other reasons, that their condition can change for the worse quickly, and the next time this occurs, they might not get better. That’s why OMG or similar is our prayer. We are already out of our depth to face the current trauma, not to say if or when the passing is to come, we are not able to cope!

God’s amazing tenderness cuts through such reality. It’s unthinkable a day or a week later how we had coped with the passing of our loved one. God takes over; he carries us through. He gives us just enough capacity of the mind to deal with things for the person.
God suffers too, when his dearly loved one passes away. He knew the feeling of dread; he experienced the receiving of that bad news that had come so very early than had initially anticipated.
Be encouraged, God cares, he carries you through the pain, he enables you to do that needs to be arranged. His name be glorified.