backseat-driving

backseat driver

noun
1.
an automobile passenger who offers the driver unsolicited advice, warnings, criticism, etc., especially from the backseat.
2.
any person who, by means of criticism, unsolicited advice, or the like, interferes in affairs that are not his or her concern or responsibility.

Origin:
1925–30

backseat driving, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
backseat driver

noun
a meddler who insists on giving unwanted advice 
WordNet® 3.0, © 2006 by Princeton University.
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