not know one's ass from one's elbow
01
to be incapable of understanding even the simplest concepts
Dialect
American
American
![{not} [know] {one's} ass from {one's} elbow definition and meaning](https://cdn.langeek.co/photo/44844/original/?type=jpeg "{not} [know] {one's} ass from {one's} elbow definition and meaning")
Idiom
Offensive
예시들
I asked him to fix the computer, but he does n't know his ass from his elbow when it comes to technology.
She claimed to be an expert chef, but she could n't even boil water. She does n't know her ass from her elbow in the kitchen.
