Context #1
Sam: Guess what? I got a new car. I got a brand new BMW.
Chris: Get out of here!
Sam: Really!
Context #2
Sharon: I finally broke up with Matt.
Tammy: Now way. Get out of here!
Sharon: Really. This time it's is over.
Meaning: "to get out of here" is a common idiom that is used when you are surprised and don't believe someone. It has the same meaning as "no way!"
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