Created using the words Oh My God OMG is considered "internet slang." As email and texting have exploaded in popularity over the years - users began abbreviating many common says. OMG was at the forefront as one of the oldest and most popular abbreviations. It has grown into pop culture status as somewhere along the way it started to represent a lot more than those 3 words. OMG!!! this shirt is awesome. the letters OMG are created out of the words Oh My God.