not know one’s ass from a hole in the ground

tv. not to be knowledgeable; not to be alert and effective. (Usually objectionable.) That stupid son of a bitch doesn’t know his ass from a hole in the ground.

Common Names:

Name	Pronounced	Usage
Natanail	-	Bulgarian, Macedonian
Liisi	LEE:-see (Finnish)	Finnish, Estonian
Mabel	['mæbəl]
Gabriels	-	Latvian
Stina	-	Swedish, Norwegian, Danish
BoŽA	-	Serbian