(uncountable) Mischievous play, especially by children.
‘Shanti and Tom are playing noisily upstairs again. They’re up to their usual shenanigans.’;
Foolish behaviour or speech.
(uncountable) Deceitful tricks; trickery, games.
‘You should learn to spot their shenanigans and avoid being fooled.’; ‘The advertisement said it would cost $50, but they charged me $75 at the register. I declare shenanigans.’;
(Cockney rhyming slang) jewellery.
foolish or senseless behavior
Tomfoolery (or Tom Foolery) is a musical revue based on lyrics and music that American mathematician, songwriter, and satirist Tom Lehrer first performed in the 1950s and 1960s. Devised and produced by Cameron Mackintosh, it premiered in London at the Criterion Theatre, directed by Gillian Lynne, on 5 June 1980, where it had a successful run.