Green’s Dictionary of Slang

to chatter pleasantly; thus burbler n., a chatty person.

1872		‘Lewis Carroll’ Through the Looking-Glass 22: The Jabberwock [...] Came whiffling through the tulgey wood, And burbled as it came!
1891		Kipling Light that Failed 150: You only burble and call me names.
1898		Kipling ‘Stalky’ in Complete Stalky & Co. (1987) 17: Now are you satisfied, you burbler?
1919		E. Pound letter 1 Feb. in Paige (1971) 148: Thank God you don’t tend to burble or to produce ‘four epics’ in one vol.
1925		Dos Passos Manhattan Transfer 301: ‘Why did we come back to this rotten town anyway?’ ‘You’ve been burbling about how wonderful it was ever since we came back.’.
1936		C. Sandburg People, Yes 176: ‘Next,’ burbled a city editor.
1960		Wodehouse Jeeves in the Offing 151: ‘Oh, Daddy,’ she burbled.
1973		T. Lewis Billy Rags [ebook] Reece staring at them shit-scared and yet burbling on to me as though nothing was happening.
1981		W. Russell Educating Rita II ii: frank: All right, but please stop burbling on about Mr Tyson. / rita: I haven’t been burbling on.