Grammar fix
You're kidding!
react with disbelief
An informal exclamation showing you're surprised and can hardly believe what someone just told you.
expressionB1core
Hear it in context
Notice where the phrase sounds natural.
You're kidding! She quit her job and moved to Spain?
A: They cancelled the whole trip.
B: You're kidding! After all that planning?
Fix the pattern
One small grammar move makes it sound right.
Not: You are kid me!
Say: You're kidding!
It's a fixed reaction: 'You're kidding!' — not 'You are kid me'.