Shenanigan (noun)

1. Mischievous or deceitful behavior.
2. A trick or deception.

Origin:

The word "shenanigan" is of uncertain origin, but it is likely derived from the irish word sionnachuighim which means "i play tricks" or "i am mischievous".

Examples:

1. The politicians were accused of shenanigans when it was revealed that they had been accepting bribes.
2. The children were up to their usual shenanigans when they put a toad in the teacher's desk.
3. The company was caught in a scheme of financial shenanigans.
4. The kids were notorious for their shenanigans on Halloween night.
5. The businessman was accused of shenanigans in the stock market.