keep on about

keep (going) on about (someone or something)

To continue or speak for a tedious or exasperating length of time. My date kept going on and on about his charity work, never even asking what I do for a living.
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keep (going) on about (something)

To speak about something tediously and at great length. Primarily heard in UK. He just kept going on about literary metaphors and imagery. I didn't know what he was talking about! She always keeps on about some new show she has started watching.
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keep (going) on about someone or something

to continue to talk excessively about someone or something. I wish you would not keep going on about Tom and Jill. Don't keep on about my haircut. It's perfect!
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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: keep, on, something