A colorful comparative insult used to describe someone of spectacularly low intelligence. Like its cousin 'dumb as a box of rocks,' it leans on an inanimate object — the doorknob — as the benchmark of stupidity. The humor comes from the deadpan logic: a doorknob performs one simple function and has no inner life whatsoever. Calling someone dumb as a doorknob suggests they may not even clear that bar.
I tried explaining the refund process to him twice, but the guy was dumb as a doorknob and kept asking the same question.
Add your own interpretation of "dumb as a doorknob".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.
Browse all .
No comments yet — say something.
(simile, slang) Very stupid.
“I have never seen anyone lie so often about so many things. How can anyone believe anything he says? Does he really think the gop are behind him at this point? Seriously, you'd have to be as dumb as a doorknob not to see how throughly he's fucked everyone.”
No comments yet — say something.