noun Informal.
Usually, shenanigans.
mischief; prankishness: Halloween shenanigans.
deceit; trickery.
a mischievous or deceitful trick, practice, etc.

1850–55, Americanism; of obscure origin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
shenanigan (ʃɪˈnænɪɡən)
1.  (usually plural) roguishness; mischief
2.  an act of treachery; deception
[C19: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1855, of uncertain origin. Earliest records of it are in San Francisco and Sacramento, California, U.S. Suggestions include Sp. chanada, a shortened form of charranada "trick, deceit;" or, less likely, Ger. Schenigelei, peddler's argot for "work, craft," or the related Ger. slang verb schinäglen.
Another guess centers on Ir. sionnach "fox."

Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He discloses a number of these governmental shenanigans that will make your
  hair turn gray.
The public is starting to view the shenanigans of the alarmist scientists with
  a jaundiced eye.
Shortcuts through space, if only for information, make possible all kinds of
  counterintuitive shenanigans.
The recession is uncovering a lot of shenanigans, as recessions usually do.
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