I think he is referring to the continuous shuffle machine which many Las Vegas casinos use. It is constantly shuffling and the drawn cards are constantly added back in. Never play this type of game.

http://mikeaponte.com/card-counting/the-truth-about-continuous-shuffle-machines-card-counting/

http://answers.yahoo.com/question/index?qid=20130705062006AAXAkX4

Barry