1 definition by Mad Jim

Having good behavior when being monitored, but bad behavior when no one is looking.

Based on the 2015 scandal where Volkswagen cars were discovered to have low emissions when the vehicle's system could tell it was being emission tested.
My son is nice to his sister when I'm around, but I worry about a Volkswagen Effect when he knows I can't see them.
by Mad Jim June 4, 2017
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