"doesn't know his ass from a hole in the ground" in Spanish
Definition
Esta es una forma muy grosera y ofensiva de decir que alguien es completamente ignorante o incapaz, especialmente en algo importante o básico.
Usage Notes (Spanish)
Extremadamente vulgar y ofensivo. Solo úsalo entre amigos de mucha confianza o en bromas; nunca en contextos profesionales ni formales. Normalmente, se usa para describir a alguien que no sabe nada de un tema.
Examples
People say he doesn't know his ass from a hole in the ground when it comes to computers.
La gente dice que él **no sabe nada** de computadoras.
My uncle doesn't know his ass from a hole in the ground about cars.
Mi tío **no sabe nada** de autos.
I'm sorry, but he doesn't know his ass from a hole in the ground in this subject.
Lo siento, pero él **no tiene ni idea** de este tema.
Honestly, that guy doesn't know his ass from a hole in the ground when it comes to fixing things.
Honestamente, ese tipo **no tiene ni idea** para arreglar cosas.
She acts confident, but she doesn't know her ass from a hole in the ground about business.
Ella actúa con confianza, pero **no sabe nada** de negocios.
You'd think after all these years he'd get it, but he doesn't know his ass from a hole in the ground.
Pensarías que después de tantos años lo entendería, pero **no tiene ni idea**.