$1/1 – Indicates the value of a coupon. In this example it is $1 off of 1 item
Blinkies – In-store coupon on shelves that spit out of the blinking machine
BOGO – Buy One Get One Free
CAT or Catalina – Coupons that print with your receipt; provided by the Catalina Marketing Company
GC – Gift Card
MFG, MFR – Manufacturer
MIR – Mail-in Rebate
MQ – Manufacturer Coupon
OOP – Out Of Pocket
OOS – Out Of Stock
OYNO – On Your Next Order
P&G – Proctor & Gamble Sunday Coupon Inserts
Q – Coupon
RP – Red Plum Sunday Coupon Inserts
SS – Smart Source Sunday Coupon Inserts
Peelie – Coupon on products you have to peel off
Stacking – Using a manufacturer’s coupon in addition to a store coupon for an even lower price
Stockpile – A supply stored for future use, usually bought when the item is at its lowest price.
Tear Pad – In-store coupon on shelves that you tear off of a pad
UPC – Universal Product Code (a.k.a. bar code)
Wholesale – The selling of goods in large quantities to be retailed by others or just purchased by us. 🙂
WYB – When You Buy

If I missed any abbreviations or if you need clarification, please leave a comment and I will update the list.