When a second person (who usually is a kid or a whimp) says when someone seems to have more of a mental & physical power over you. They tell you to leave because of a particular problem.
Often heard in movies where the characters are Italian Americans living in New York.
It simply means that you don't believe what someone else said.
Henry Hill: There it is, you see that Mike? You see that Helicopter? See it right there, right infront of us there? I think it's been following me all morning.
Mikey: Get the fuck outta here! What are you, nuts?
finding out a class is to hard too pass and too late to drop, the student will opt to pass the class with a C and get the fuck outta there
Ben:"hey, do you know how to do example 4?"
Nate:"Naww man i dont even get what were doing to be honest"
Ben:"What! Are you serious!?"
Nate:"Yeah im going to have to C the fuck outta here