not know your ass from your elbow
US /nɑt noʊ jʊər æs frəm jʊər ˈɛl.boʊ/
UK /nɑt noʊ jʊər æs frəm jʊər ˈɛl.boʊ/
1.
아무것도 모르다, 바보이다
to be very stupid or ignorant; to lack basic knowledge or common sense
:
•
He's so incompetent, he doesn't know his ass from his elbow.
그는 너무 무능해서 아무것도 몰라.
•
Don't ask him for help; he doesn't know his ass from his elbow when it comes to computers.
그에게 도움을 요청하지 마. 그는 컴퓨터에 대해 아무것도 몰라.