Wiktionary
dumb bunny
n. (context idiomatic English) A stupid person
Usage examples of "dumb bunny".
He came to Vegas like a dumb bunny, and moves like that will get him dropped.
Let's go find that dumb bunny who answers phones and goes off on vacation.
A detective-inspector is pretty small fry at Scotland Yard and if he thought I couldn't see what he was up to he must have thought I was a dumb bunny.
These tasks were never too exacting, because she made no secret of her opinion that I was a bit of a dumb bunny.
She'd been wrapped in a warm glow of anticipation ever since that dumb bunny Tim had handed her the ticket just as they went into the lottery office.