“No way! Get out of here!”

Your brother tells you that he met a really famous celebrity. You're surprised that he met someone so famous, so you say:

No way! Get out of here!

No way!

This is an expression that people say when they're really surprised by something. For example, if your wife told you she saw an old friend of her, you can say:

No way!

This expression is casual and means something close to "I can't believe it!". 

Get out of here!

When someone tells you something that's:

• surprising
• really exciting or good news
• possibly a trick

For example:

A: Mom, I got into Harvard.

B: What!? Get out of here!

Of course, you can also tell people "Get out of here!" when you're actually mad at them and want them to leave. People will usually know whether you're surprised or angry based on the situation. Your facial expressions also give people clues. If you say "Get out of here!" while you're smiling, people will think that you're happy and surprised. If you say it while frowning, they'll think that you're angry.