Coupon Trash
A socioeconomic class of "people" who use coupons, vouchers, online discount codes, etc.
Store trainee: These customers brought in a coupon for a 2 for 1.
Store manager: Ugh, coupon trash. Process them quickly, then get them out of my shop.
Store manager: Ugh, coupon trash. Process them quickly, then get them out of my shop.