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American 1980s slang for a person that has joined MI6.

Based off of a combination of the American slang word "carny," meaning someone who works for the carnival, and also "The Circus," for the British Secret Service agency MI6.
The former American CIA operative said, "Hey, I heard you turned Carny on us."

"Nope," The Equalizer replied in his English accent, "I just retired."
by g9ford December 26, 2012