talk head off

talk (one's) head off

To talk endlessly and exhaustingly. I love my Aunt Lily, but she talks her head off whenever I go to visit her. Sorry, I've been talking my head off about my research. I hope I'm not boring you!
See also: head, off, talk
Farlex Dictionary of Idioms.

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.
See also: head, off, talk

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.
See also: head, off, talk
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

talk one's head off, to

To be extremely loquacious. This hyperbole, also put as to talk someone’s head or someone’s ear off, implies that the boredom of relentless loquacity is making either the speaker’s or the listener’s head fall off. These expressions have largely replaced the earlier talk the hind leg off a horse/ donkey/dog, current from the mid-nineteenth to the mid-twentieth century. G. and S. Lorimer point out, in The Heart Specialist (1935), “An American will talk your ear off about his sport with a little encouragement.”Yet another is talk the ear off a brass monkey. See also like greased lightning.
See also: head, talk
The Dictionary of Clichés by Christine Ammer
See also:
  • be shouting (one's) head off
  • be shouting your head off
  • bite someone's head off, to
  • knock (someone or something) on the head
  • knock someone or something on the head
  • knock something on the head
  • love-tooth in the head
  • a head
  • head in
  • head for the setting sun