This means that your newly purchased product that sentence is aimed at was a disastrous mistake to buy.
The sentence is used originally for those who bought Shogun 2, and were suprised by the shitty
game. Later on, they would use it for any failured purchases.
¨I bought this new
game for 55 bucks, it became a shogun¨
¨I
hope this new game isn't going to be a shogun¨