You and a friend watched a Hollywood action movie together. Your friend asks who the lead actress was. She's really famous, so you're shocked that your friend doesn't know her name. This is your response.
Dude! Have you been living under a rock? She's über-famous!
People sometimes call each other "dude" in casual conversation. For example:
A: Dude, we've got to get going. We're going to be late.
B: Dude, chill out.
"Dude" is mostly used between two young or middle-aged men. However, women sometimes use it and people sometimes use it toward women too. Originally, "dude" was associated with surfers. In the past 30 years it has become much more common, but now some younger people choose other words to refer to each other like "bro".
People mostly say "Dude" at the beginning of a sentence. It's possible at the end of a sentence but less common.
Nice shot, dude.
When a person doesn't know about recent news, culture, or entertainment that's extremely well-known, you can ask:
Have you been living under a rock?
It means "How is it possible for you to not know about this?"
Another way that people use "living under a rock" is:
Unless you've been living under a rock, you've probably heard about...
"Über" is an adverb that means "very" or "extremely". It's taken from German, but English speakers use it from time to time. The most common adjectives that combine with "über" are:
You can see that it's mostly for talking about very cool, fashionable, high-status things.
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