Definition of SHENANIGAN
: a devious trick used especially for an underhand purpose
a : tricky or questionable practices or conduct —usually used in plural b : high-spirited or mischievous activity —usually used in plural
Examples of SHENANIGAN
Example: You need protection from hacker shenanigans
shenanigan (plural shenanigans)
Trickery, games; skulduggery. To “call”, “claim” or “declare” shenanigans is to rhetorically label something as officially deceitful, improper, or otherwise incorrect.
“The advertisement said it would cost $50 but they charged me $75 at the register. I declare shenanigans.” The speaker passes off the statement as having some sort of implied official effect, but in reality, it is simply a complaint.
A deceitful confidence trick, or mischief causing discomfort or annoyance.
You should learn to spot their shenanigans and avoid being fooled.
Mischievous play, especially by children.
 Usage notes
Much more common in its plural form.