Well, the obvious conotation is betting/blackjack. However, these are 2 sort of jumbled words that dont make a whole lot of sense. I think were looking at "double or nothing" and "bust". Now, you can double down your bet for 1 card (if your at 10/11 depending on the casino) but very few places will let you do this on 12. Since you only get 1 card on 10 or 11, there is no way for you to bust...
thus... in this game - if you double, you cant bust...
Hope you follow my logic on this one, but I dont see a use for this in the gaming industry