What does the expression 'are you for real mean?
From Second Nature Online English - Vocabulary-Common Expressions (Unit 2.3)
Showing Disbelief or Surprise:
Are you serious?
You're making this up, aren't you?
No way! (Informal)
Are you for real? (Informal)
Are you pulling my leg? (idiom) (to pull someone's leg = to fool someone)