Top definition
placeboing is when you take something you think is a drug, but isnt, and instead of tripping on a drug you trip out because your brain thinks you took a drug. causes anything from mild paranoia to city-wide power outtages.
Dude, i ate this shroom i found on some shit and went crazy. didnt see any purple ninja unicorns though..

You were probably placeboing dude.
by wishiwasbritish May 17, 2010
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