I also have played many a blackjack games starting in the late 60's in Las Vegas, and like Don, have never heard the terminology "Snapper" until I became a chipper.

By the way, I know no one is interested, but I also have given up blackjack as well as any other casino backed game since the mid 80's after realizing it was not possible to beat the dealer (casino.) I now stick strictly to live poker.