Coupon slang

What do all these things mean?? here are a few that I know I use a lot. As I use more, I will add them.

BOGO- Buy One Get One. This means BOGO-FREE, but we leave off the F :) If it's anything like Buy 2 get one Free, it will be B2GO, etc. There are also a lot of deals where it's BOGO50%, which is buy one, get one 50% off :)

OOP- Out Of Pocket, meaning what you are going to physically pay out of your pocket

Q- Coupon

Manu- Manufacture coupon.

Store- Store coupon

WAGS- Walgreens

RR- Register Rewards from Walgreens

ECB- Extra Care Bucks from CVS

Stack- stacking is using 2 coupons for one item- 1 store, 1 manu

RC- Raincheck

WYB- When You Buy