can't/couldn't tell shit from Shinola

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can't/couldn't tell shit from Shinola

rude slang Exceptionally naïve, unworldly, ignorant, or undiscerning. (Shinola is a brand of shoe polish, which is usually black or brown.) Why did you send a kid to be my partner on this case? He couldn't tell shit from Shinola! She can't tell shit from Shinola, and they're promoting her to head of Human Resources? Gimme a break!
See also: Shinola, shit, tell

tell shit from Shinola

verb
See also: Shinola, shit, tell