mystery shop noun 1verb 1forms 3 noun1 •An instance of mystery shopping; a visit to a business as a mystery shopper.Immediately following the mystery shop, the independent contracter will fill out a static questionnaire that records respective levels of disclosure, customer service and sales effectiveness. — 1994 verb1 •To work as a mystery shopper; to pose as a customer or client in order to evaluate a business.Don't assume that because you have been mystery shopping for a while, or because you have mystery shopped for the same company or client before, that you know what to do. — 2004 formsmystery shopped · mystery shopping · mystery shops