Define Dumber Than Shit Meaning

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.
By Adan
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.
By Emlyn
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.
By Minnaminnie