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. © 2015 Farlex, Inc, all rights reserved.

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 Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

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, to
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer