Ever been ripped off at three card monte or some other con? Well, you're the victim of a shenanigan, a clever form of deception, usually designed to part the unwary from their money.
Not all shenanigans are financially motivated; an equally popular meaning is simply high spirits or boisterous behavior that might upset or annoy others, though usually not with any serious intent. It seems to be a word frequently applied to the Irish, with their established love of the high-spirited and artful ploy, and in fact may well come from the ancient Irish word sionnach, meaning "fox" — a traditionally sly beast.
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