The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with by the short hairs
by the short hairs
Under one's complete control. This expression is often used with get or have, as in She had her husband by the short hairs. It is in effect a euphemism for have someone by the balls, the hairs in question being pubic hair.
[ ; second half of 1800s