Right now, our language is actively enriched with modern youth expressions, and it's not just a trend — it's a whole cultural phenomenon! For example, the phrase “OMG - it's such a sincere, slightly dramatic expression of admiration for something really cool. There's also the variant “omg this”, which similarly means that something impressed or surprised you.
Expressions like “OMG” or “omg” come from English — an abbreviation of “Oh My God”, which can be translated as “Oh God”. Young people actively use these expressions to convey their emotions more quickly, and in general, to sound more trendy and modern. In short, such expressions make communication easier and more dynamic.
Here's an example: your friend sent you a photo of a very delicious dish he cooked himself. And here you respond: “OMG this looks just fantastic!” In this case, “OMG this” conveys your genuine surprise and admiration.