Extreme Couponing Tip: Common Abbreviations - The Krazy Coupon Lady Extreme Couponing Tip: Common Abbreviations BOGO: Buy one, get one. Will usually end with "free" or "half off" meaning buy one, get one half off, or buy one get one free. ... KCL: Krazy Coupon Lady, refers to TheKrazyCouponLady.com. MFR: Manufacturer. MIR: Mail in Rebate, refers to rebates which must be submitted by mail. These are the ...