go on and on about someone/something

go on (and on) about (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.
See also: go, on

go on (and on) about someone/something

in. to rave about someone or something endlessly. Why do you have to go on about your sister so?
See also: and, go, on, someone, something