talk one’s 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 one’s head off

tv. to talk endlessly; to argue persuasively or vigorously. I talked my head off trying to convince them.
See also: head, off, talk
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
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