know one's ass from a hole in the ground
/nəʊ wʌnz æs fɹəm eː hɒl ən ðə ɡɹaʊnd/
have basic understanding or competence
“Often, one does not know one's ass from a hole in the ground.”Add to my deck
/nəʊ wʌnz æs fɹəm eː hɒl ən ðə ɡɹaʊnd/
have basic understanding or competence
“Often, one does not know one's ass from a hole in the ground.”Add to my deck