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 dog shit

Someone of low intelligence. A person who is so stupid you feel sorry for him. This type of person tries to sound intelligent but the truth is in reality they are dyslexic slow learners and can't even figure out how to achieve the basics of life. They are dumber than dog shit.

1. He couldn't add 2+2.. he's dumber than dog shit.

2. Rehmeyer sure attempts to make his posts sound intelligent but the truth is he's really dumber than dog shit.

dumber than dog shit by kr3493k February 14, 2008

dumber than owl shit 

Meaning less intelligent than the excriment of a flighted nocternal bird who feasts on small rodents and posses the capability of viewing 180 degrees.

People walking under downed power lines are dumber than owl shit.

dumber than owl shit by Chris Wollesen April 1, 2006

dumber than a box of brick shit

completly useless , waste of skin on a voyage to dipshit land.

That cop was dumber than a box of brick shit.
That guy really thought his wife got lost in oklahoma for six hours. He must be dumber than a box of brick shit.

dumber than a box of brick shit by pinhead77 December 15, 2008