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
Amrit	-	Indian, Hindi
Hephaestus	hi-FES-təs (English), hi-FEES-təs (English)	Greek Mythology (Latinized)
Apphia	AF-ee-ə (English), AP-fee-ə (English)	Biblical
Bobbie	['bɔbi]
Angjelko	-	Macedonian
Jeannine	zha-NEEN (French), jə-NEEN (English)	French, English