be on about

be on about (something)

To speak about something tediously and at great length. Primarily heard in UK. He just kept rambling about literary metaphors and imagery. I didn't know what he was on about! She's always on about some new show she has started watching.
See also: on
Farlex Dictionary of Idioms.

be on about

talk about tediously and at length. British informal
See also: on
Farlex Partner Idioms Dictionary

be/go/keep ˈon about something

(informal, disapproving) keep talking about the same thing so that people become bored or annoyed: What’s she on about now? Don’t keep on about your terrible journey. It’s so boring.
See also: go, keep, on, something
Farlex Partner Idioms Dictionary
See also:
  • be on about (something)
  • be on about something
  • be/go/keep on about something
  • keep (going) on about (something)
  • ramble on
  • rattle on
  • rattle away
  • explain
  • at great length
  • length