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Phrase(s): talk one’s head off
Fig. Inf. to talk endlessly; to argue vigorously. • I talked my head off trying to convince them. • Don’t waste time talking your head off to them., Phrase(s): talk someone’s head off
1. Fig. [for someone] to speak too much. • Why does John always talk his head off ? Doesn’t he know he bores people? • She talks her head off and doesn’t seem to know what she’s saying. 2. Fig. to talk to and bore someone. • John is very friendly, but watch out or he’ll talk your head off. • My uncle always talked my head off whenever I went to visit him.
McGrawhill's American Idioms And Phrasal Verbs