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When somebody announces that they farted even though they didn't. The victims are tricked into thinking this is the truth, and they mentally create the smell of a fart, thinking its real.
Guy 1: "Dude I just ripped a huge one!"

Guy 2: *breathes in* "Aww gross man, that's nasty!"

Guy 1: "Dude I'm kidding. I made a placebo fart."
by SupaC July 19, 2010
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