Definitions for practical joker
Random House Webster's College Dictionary
a playful trick, often involving some physical agent or means, in which the victim is placed in an embarrassing or disadvantageous position.
Origin of practical joke:
prankster, cut-up, trickster, tricker, hoaxer, practical joker(noun)
someone who plays practical jokes on others
someone who instigates practical jokes
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"practical joker." Definitions.net. STANDS4 LLC, 2013. Web. 20 May 2013. <http://www.definitions.net/definition/practical joker>.