you don't know your ass from a hole in the ground 

"You don't know your ass from a hole in the ground." Illustrate with a pen and paper drawing a circle and a cracked circle. Now ask which is your ass and which is the hole in the ground. Subject points to cracked circle and you mock while pointing to their real derriere.

After listening to untruthful gibberish, you say to person, "you don't know your ass from a hole in the ground."

you don't know your ass from a hole in the ground by 13Ronbets May 16, 2016

Difference between his asshole and a hole in the ground. 

A metaphor relating to a stupid, ignorance, and educated person that can not distinguish similarities between items or objects.

George is so stupid, he don't know the difference between his asshole and a hole in the ground.

Difference between his asshole and a hole in the ground. by KD.Stinkmeaner November 15, 2011

Can't tell me arse from a hole in the ground 

Southern British slang meaning I ain't got a clue woss goin on.Best discription of an acid trip I've ever heard.

Fuckin ell,I can't tell me arse from a hole in the ground!

Can't tell me arse from a hole in the ground by GavinS January 14, 2011

Fuck a hole in the ground 

To be unscrupulous regarding sexual partners

He’d fuck a hole in the ground if it winked at him

Fuck a hole in the ground by Akirabod December 20, 2023

you dont know your ass from a hole in the ground 

you know nothing or you dont know what you are doing

sir you dont know your ass from a hole in the ground

you dont know your ass from a hole in the ground by bluebear April 3, 2025