OMG. “OMG” is the most common replacement for “oh my god.”. It’s the abbreviation, which was commonly adopted in text format. However, we can use it in many informal written cases today, and everyone understands what the letters stand for. Even though “OMG” stands for “oh my god, ” no one cares about the religious intention behind the original meaning. The abbreviation has become its own phrase, which steers clear of the original meaning.