dumber than dumb 

Willfully refusing to use common sense and good judgement. Taking an already poor idea and taking it to the extreme.

On Halloween, Amber Langford and Annie Collinge acting, dumber than dumb, dressed up as exploding twin towers, without sympathy to the 2,977 victims of a terrorist attack at the World Trade Center in NYC on 9/11/2001 at Rosie's Club in Chester, UK. The costumes of the two girls featured the North and South Towers with paper representing fire and smoke protruding from the buildings which where made to appear as short mini-dresses.

dumber than dumb by A pissed-off New Yorker November 11, 2013

dumber than a box of rocks 

when ur pretty dumb. my mom says this to me all the time.

Ur dumber than a box of rocks
-what?
shut up dumbass

dumber than a box of rocks by barbarino April 18, 2005

Dumber than a rock 

A guy named Michael who acts like he knows everything and does stupid shit.

Michael: How do you spell "sexist"
Me: You're dumber than a rock

Dumber than a rock by 093707053 July 3, 2018

dumber than a box of rocks 

Phrase describing a person who lacks the collective intelligence of a box of rocks; possibly a bit more intelligent or a bit less intelligent than a person who is dumb as a rock.

John lit a match so he could see where the gas was leaking out; he's dumber than a box of rocks.

dumber than a box of rocks by Rocky Balbowa December 20, 2007

dumber than shit 

The absolute dumbest level a person can be. This person would score a negative number on an IQ test.

Mike Tyson is dumber than shit.

dumber than shit by MnB75 March 5, 2005

Dumber than a rock on a bad day 

Dumber than a rock on a bad day, which would be dumber on the dumb scale compared to "Dumber than a rock".

Friend 1: Your dumber than a rock!
Friend 2: Your dumber than a rock on a bad day!
Friend 1: Shit.

Dumber than a rock on a bad day by jeffboi42 August 20, 2020

Dumber Than A Bag Of Hair

When somebody you know is dumber than a bag of hair.
A person consistently failing to understand anything you're saying.
When somebody is saying unintelligible nonsense.

1. He's Dumber Than A Bag Of Hair.
2. They're Dumber Than A Bag Of Hair.

Dumber Than A Bag Of Hair by Anthony Luka Davenport September 24, 2023