(1). An acronym for Buy One, Get One.
(2). In retail, a term used to describe a sale that lures naive customers into buying surplus, out of season products they will never use, by offering them 2 of these items for the same price.
“Hey Steve, did you see that BOGO sale going on over at Dick’s Sporting Goods? I know it’s May and the season just ended, but I think I am totally going to get into snowboarding next year! And if I buy one pair of snow pants, I get a second pair for free! How can I go wrong?