Dumb as rocks

Referring to someone that has no intelligence. No common sense. Someone who is just dumb, as rocks have no intelligence.

Neil: Dude you gotta check out this new car I got!!
Bob: What kind of car did you get??
Neil: A black one, it's awesome.
Bob: (thinks to himself; "this dude is dumb as rocks.")

by cpetkunas July 01, 2020

dumb as a rock

Terminally stupid.

The perp was dumb as a rock, and confessed in five minutes.

by Octopod November 08, 2003

dumb rocks

Rocks that are abnormally lacking in smarts.

"I didn't think it was possible, but that rock is dumber than most."

by Lord_D October 21, 2004

Dumb ass a rock

Dumb as a rock combined with asshole and increased stupidity.
Most of people of this category do not understand the difference between Dumb as a rock and Dumb ass a rock

Guy 1: Your mom is as dumb as a rock.
Guy 2: Nope. She is ass dumb ass a rock.

by Jekr December 10, 2018