The phrase 'Funny Farm' refers to a psychiatric hospital or insane asylum.
Example of Use: “If you don’t stop acting so weird, they’re going to send you to the funny farm.”
The phrase 'funny farm' came from the slang use of the word 'funny' to mean unusual or weird, and the description of mentally disturbed people as 'funny in the head.' An early use of the term 'funny farm' can be found in John Knowles’ 1959 novel, A Separate Peace: “You might start to believe it, then I’d have to make a reservation for you at the Funny Farm."