"Oh My God!" is a popular expression used to convey surprise, shock, or excitement. It is often abbreviated as OMG in text messages and online communication. The phrase can be used in various contexts, from reacting to unexpected news to expressing joy over a positive event. The expression has also been featured in various forms of media, including songs, movies, and television shows. Notably, it has been used by celebrities like Katy Perry in her song "Oh My God!" and has become a cultural catchphrase, reflecting the emotions of modern communication.