What is "what are you on about?" on about?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Digital Sunset Looping

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Chapters
00:00 What Is &Quot;What Are You On About?&Quot; On About?
00:34 Accepted Answer Score 13
01:49 Answer 2 Score 1
02:05 Answer 3 Score 1
02:18 Thank you

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Full question
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Tags
#etymology #idioms

#avk47