use the user (uncountable)
- (advertising) A promotion that offers some additional bonus to customers who refer further customers.
1931, American Gas Engineering Journal, volumes 134-135, page 8:A "Use the User" plan will also be conducted by the outside salesmen and by the floor sales people by telephone.
1962, George Meredith, Effective Merchandising with Premiums, page 140:Use-the-user premium plans can be devised to fit a great many different types of businesses. Among the largest users of such techniques are appliance manufacturers and their dealers, […]