be on about (something)

be on about (something)

To be 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

be on about

talk about tediously and at length. British informal
See also: on

be ˈon about something

(informal) talk about something; mean something: I didn’t know what he was on about. It didn’t make sense.
See also: on, something