know one’s ass from a hole in the ground

tv. to be knowledgeable; 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
Jarl	YAHRL (Norwegian, Swedish, Danish)	Norwegian, Swedish, Danish, Norse Mythology, Ancient Scandinavian
Warin	-	Ancient Germanic
Hrafn	-	Icelandic, Ancient Scandinavian
Mintxo	-	Basque
Wall	[wɔ:l]
Dwyer	['dwaiə]