"you must be joking!" or "you can't be serious!"
John Bull: "The Labour Party winning a majority in the next election?? My good man...surely you jest!"

John Doe: "I jest you not! And don't call me Shirley!"

by Polo December 29, 2007
Get a surely you jest! mug for your barber José.
An iconic meme used by instagram user glutenpee
“Have you heard of glutencord?”
Glutencord? Surely you jest”
by Pawgers December 10, 2020
Get a Surely you jest mug for your girlfriend Rihanna.