Porco Dio

"Porco Dio" litterally means "God Pig", and it's one of the most famous Italian phrases, commonly used as an imprecation. Even though the majority of italian people use it, it is considered by some (especially Christians or religious people in general) a taboo word, so it is recommended to use it only when you know the person you're talking to/with. There are many variations of the phrase, such as: "Dio Maiale", "Dio Cane", "Madonna Suina", "Porca Madonna" and the not-so-famous "Dio Babbuino". You can even add other swear words to it, even forming a really long "bestemmione". Porco Dio and its variants are growing famous even among teenagers and children (e.g. 13 year old kids), probably thanks to the influence of the famous Italian youtuber "Blur", who likes to use them in his videos, watched by almost half a million teenagers.