You've got to be kidding me!

Someday I watched a movie the titled “Hansel and Gretel the witches’ hunters 3D” and I found idiom,

Gretel: [upon seeing the abandoned candy house from childhood] You must be fucking kidding me?

(http://www.rottentomatoes.com/m/hansel_and_gretel_witch_hunters/quotes/)

I wondered to know what the meaning in Indonesian. So I am looking for the meaning of that idiom. 
I have found the best answers;

It mean's ''you must be lying to me'' as in telling a joke or fooling someone.

It can also be a more dramatic way to say ''really?'' when the person is shocked by what they're being told.

situation:

Jane: "John drove his new car into a tree."

Susan: ''You've got to be kidding me!''

situation 2:

Jane: "John drove his new car into a tree."

Susan: "Really?!"

It's like saying "you can't be serious." It's something a person says when they're in disbelief.

(https://answers.yahoo.com/question/index?qid=20100703012410AAXUNU7)