you/he/she must be joking

idiom

Definition of you/he/she must be joking 

used say that what someone is saying is very surprising or hard to believe "He said the report is due by tomorrow." "He must be joking."

Learn More about you/he/she must be joking

Share you/he/she must be joking

Resources for you/he/she must be joking

Statistics for you/he/she must be joking

Look-up Popularity

Comments on you/he/she must be joking

What made you want to look up you/he/she must be joking? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

required by fashion, etiquette, or custom

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!