noun

• (countable, chiefly in the plural) singular of shenanigans: a deceitful confidence trick; also, an act of mischief; a prank, a trick; an act of mischievous play, especially by children.
  "I spotted his next shenanigan—saw it coming—and so avoided being fooled."
• (uncountable, dated, rare) Dishonest, underhanded, or unscrupulous activities or behaviour; skulduggery, trickery; also, mischievous behaviour or play; high jinks.
  "One of Professor [John] Moon's most astonishing "experiments," consisted of holding a watch suspended from a short chain at arm's length, and allowing anyone in the pit to pull pistol and "blaze away" at the word "fire," whereupon the watch would most unconscionably disappear. An individual who had attended several evenings and witnessed the "experiment," suspected, in the classic language of the times, that there was something of "shenanigan" in it."

verb

• (transitive) To play a deceitful confidence trick on (someone); to swindle, to trick; also, to carry out an act of mischief on (someone); to prank.
  "The habit of "shenaniganing" has become so disgracefully common at Union college that some of the right minded students have passed resolutions condemning the practice in unqualified terms. We are happy to inform the friends of Michigan University that this unmusical word, which, translated means the use of artificial aids, in examinations, is almost wholly unknown here."
• (intransitive) To play a deceitful confidence trick; also, to carry out an act of mischief.
  "Then after much shenaniganing around over a period of several weeks […] we came into the committee room after this "night study" which I understand too place, and some of the Members had the bill we are now considering in a mimeographed form and some of us did not have it."