Idioms about Idiots: He Doesn't Know Shit from Shinola

 

• Almost always used in negative constructions to describe someone's ignorance or stupidity, such as: He doesn't know his ass from a hole in the ground.

• find one's ass with both hands and a flashlight
• (archaic) know B from a battledore
• know one's ass from one's elbow
• know one's head from a hole in the ground
• know one's head from one's ass
• know shit from Shinola
• know what one is about
• know which end is up
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