Zow
Footballguy
There's actually a sweet gif of me hitting this way in the Otis Diet thread that I added for shtick. I'll try to find it.Woz can explain it better but basically you start with your back foot barely touching the back outside corner of the batters box with the bat on your shoulder and open stance so your feet are parallel to the pitchers mound. When the ball is in the air bring your front foot forward into the traditional batting stance and you take a couple steps forward and hit the ball with all your momentum going forward. It's difficult to get the timing down and most people look foolish attempting it though good players really lace the ball when hitting this way.
But the way Pipes describes it is correct. It essentially allows the batter to gain momentum or position his hips better to hit an outside or inside pitch while not losing torque through the swing. I actually find it much easier to hit the right field line (as a right handed hitter) with this approach).