dumb rocks
Rocks that are abnormally lacking in smarts.
"I didn't think it was possible, but that rock is dumber than most."
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.")
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.")
dumb as a rock
Terminally stupid.
The perp was dumb as a rock, and confessed in five minutes.
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
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.
Guy 2: Nope. She is ass dumb ass a rock.