be on about something
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. © 2015 Farlex, Inc, all rights reserved.
be ˈon about something(informal) talk about something; mean something: I didn’t know what he was on about. It didn’t make sense.
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.
Farlex Partner Idioms Dictionary © Farlex 2017