- a stupid person.
Origin of dumb bunny
First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
A stupid person, as in She was a bit of a dumb bunny but very nice. This expression implies some toleration or endearment of the person. [c. 1920]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.