Jaca
A jaca is a useless piece of trash, usually a woman, who can't even tie her own shoes. It's like a horse that only knows how to ride and nothing else.
My aunt is a jaca. She can't even cook eggs without burning the house down.
Your jaca mom still can't find her keys after 30 years.
That jaca in my class failed math, science, and the art of being annoying.