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arse about

British  

verb

  1. slang (intr, adverb) to play the fool; act stupidly, esp in an irritating manner

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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This is just such a fundamentally stupid decision, I’m not even going to be bothered trying to be a smart arse about it.

From The Guardian • Feb. 13, 2019

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